Project C7;     (2007 - 2014)

 Project List   Abstracts   All Publications 

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Populations of Astrophysical Sources

    Principal Investigators: R. Neuhaeuser, K. Werner

We will investigate very young, oscillating neutron stars (NS), precessing NS, and old binary NS, the most prominent sources of gravitational waves. We will consider a non-homogeneous spatial distribution of the birth rate of very young NS over the sky due to the nearby Gould Belt, a torus-like structure around the Sun younger than 50 Myrs with several thousand stars including both young NS (one of them shows precession) and supernova progenitors. The goal is a clear prediction of the NS birth rate in the Gould Belt and the fraction of NS-NS binaries in the Belt. (Project Part 1)

Isolated NS are potential sources for constraining the equation-of-state of matter at ultra-high densities. The determination of the mass can be achieved by measuring the surface gravity or gravitational redshift from absorption lines. Here, strong magnetic fields and polarization effects become important, so that we will investigate radiation transfer through the geometrically thin NS atmosphere. The goal is to construct a new generation of non-LTE model atmospheres for neutron stars. (Project Part 2)

Very young, oscillating neutron stars (NS), precessing NS, and old binary NS are among the most prominent sources of gravitational waves. We will investigate all three populations. In particular, we will consider the possibility of non-homogeneous spatial distribution of the birth rate of very young NS over the sky due to the nearby Gould Belt, a torus-like structure around the Sun younger than 50 Myrs with several thousand stars including both young NS (one of them shows precession) and supernova progenitors. We will compile the present and initial mass function of the Gould Belt from low- to high-mass stars, taking into account for the first time the latest Hipparcos and ROSAT results on its member stars, newly observed multiplicities and metallicities of the Gould Belt stars, and the possibly non-constant star formation rate. The goal is a clear prediction of the NS birth rate in the Gould Belt and the fraction of NS-NS binaries in the Belt. We will also search for more young nearby isolated NS, both in the Gould Belt and on the whole sky by deep optical and X-ray observations, one of them (RXJ0720) is known to be precessing. (Project Part 1)

Isolated NS are potential sources for constraining the equation-of-state of matter at ultra-high densities, so that we plan to contribute towards obtaining mass, radius, and/or rotation rate for the known isolated NS, including the Anomalous X-ray Pulsars (AXP), the Soft Gamma-ray Repeaters (SGR), and the nearby radio pulsars within the Gould Belt.

A NS radius can be deduced from the Stefan-Boltzmann law, once distance (parallax) and temperature (spectral continuum or color) are obtained (e.g. RXJ1856). The determination of the mass can then be achieved by measuring the surface gravity or gravitational redshift from absorption lines. Here, strong magnetic fields and polarization effects become important, so that we will investigate radiation transfer through the geometrically thin NS atmosphere. The goal is to construct a new generation of non-LTE model atmospheres for neutron stars. With these models we will analyse the thermal spectra of isolated NS, concentrating on objects which display absorption features in their soft X-ray spectra. Model fits to the spectra can constrain NS masses and radii and, hence, the equation-of-state for superdense matter in the NS interior. (Project Part 2)

Researchers

  Baha Dincel   PhD Student, 2012
  Valeri Hambaryan   Postdoc, 2007
  Ralph Neuhaeuser   Professor, PI 2007
  Anna Pannicke   PhD Student, 2013
  Valery Suleymanov   Postdoc, 2007
  Klaus Werner   Professor, PI 2007

Former Associates
  Ludwig Trepl   PhD Student, 2009-2010
  Thomas Eisenbeiss   PhD Student, 2007-2011
  Thomas Eisenbeiss   Postdoc, 2011
  Markus Hohle   PhD Student, 2007-2011
  Markus Hohle   Postdoc, 2011-2013
  Nina Tetzlaff   PhD Student, 2009-2012
  Nina Tetzlaff   Postdoc, 2012-2013

Publications

[1] A new X-ray transient neutron star
Hambaryan V., Wagner D., Schmidt J., Hohle M.M., Neuhaeuser R., Monthly Notices of the Royal Astronomical Society, submitted (2014)

[2] The critical accretion luminosity for magnetized neutron stars
Mushtukov A. A., Suleimanov V. F., Tsygankov S. S., Poutanen J., Monthly Notices of the Royal Astronomical Society, accepted for publication, 2014

[3] The neutron star in HESS J1731-347: CCOs as laboratories to study the equation of state of superdense matter
Klochkov D., Suleimanov V., Puehlhofer G., Yakovlev D., Santangelo A., Werner K., Astronomy and Astrophysics, accepted for publication, 2014

[4] A transient event in AD 775 reported by al-Tabari: A bolide - not a nova, supernova, or kilonova
Neuhaeuser R., Kunitzsch P., Astronomische Nachrichten 335, 968-980, 2014

[5] A solar super-flare as cause for the 14C event in AD 774/5?
Neuhaeuser R., Hambaryan V.V., Astronomische Nachrichten 335, 949-963, 2014

[6] Wide-Field Plate Archive of the University Observatory Jena
Poghosyan, A.V., Pfau, W., Tsvetkova, K.P., Mugrauer, M., Tsvetkov, M.K., Hambaryan, V.V., Neuhaeuser R., Kalaglarsky, D.G., Astronomische Nachrichten 335, 440-447, 2014

[7] Modeling the EUV spectra of optically thick boundary layers of dwarf novae in outburst
Suleimanov V., Hertfelder M., Werner K., Kley W., Astronomy and Astrophysics, 571, A55 (14pp), 2014

[8] The influence of accretion geometry on the spectral evolution during thermonuclear (type I) X-ray bursts
Kajava J.J. E., Nattila J., Latvala O-M., Pursiainen M., Poutanen J., Suleimanov V. F., Revnivtsev M. G., Kuulkers E., Galloway D. K., Monthly Notices of the Royal Astronomical Society, 445, 4218-4234, 2014

[9] The effect of accretion on the measurement of neutron star mass and radius in the low-mass X-ray binary 4U 1608-52
Poutanen J., Nattila J., Kajava J. J. E., Latvala O.-M., Galloway D. K., Kuulkers E., Suleimanov V. F., Monthly Notices of the Royal Astronomical Society, 442, 3777-3790, 2014

[10] Relation between the X-ray and optical luminosities in binary systems with accreting nonmagnetic white dwarfs
Revnivtsev M. G., Filippova E. V., Suleimanov V. F., Astronomy Letters, 40, 177-184, 2014

[11] Carbon Neutron Star Atmospheres
Suleimanov V. F., Klochkov D., Pavlov G. G., Werner K., Astrophysical Journal Supplement, 210, 13 (8pp), 2014

[12] A Galactic short gamma-ray burst as cause for the 14C peak in AD 774/5
Hambaryan V.V., Neuhaeuser R., Monthly Notices of the Royal Astronomical Society 430, 32-36, 2013

[13] New Constraints on the Cooling of the Central Compact Object in Cas A
Posselt B., Pavlov G. G., Suleimanov V., Kargaltsev O., Astrophysical Journal, 779, 186 (18pp), 2013

[14] A Reflection Model for the Cyclotron Lines in the Spectra of X-Ray Pulsars
Poutanen J., Mushtukov A. A., Suleimanov V. F., Tsygankov S. S., Nagirner, D. I., Doroshenko V., Lutovinov A. A., Astrophysical Journal, 777, 115 (8pp), 2013

[15] The boundary layer in compact binaries
Hertfelder M., Kley W., Suleimanov V., Werner K., Astronomy and Astrophysics, 560, A56 (8pp), 2013

[16] A non-pulsating neutron star in the supernova remnant HESS J1731-347/G353.6-0.7 with a carbon atmosphere
Klochkov D., Puehlhofer G., Suleimanov V., Simon S., Werner K., Santangelo A., Astronomy and Astrophysics, 556, A41 (6pp), 2013

[17] On the spreading layer emission in luminous accreting neutron stars
Revnivtsev M. G.; Suleimanov V. F., Poutanen J., Monthly Notices of the Royal Astronomical Society, 434, 2355-2361, 2013

[18] Comparative analysis of photometric variability of TT ARI in the years 1994-1995 and 2001, 2004
Belova A. I., Suleimanov V. F., Bikmaev I. F., Khamitov I. M., Zhukov G. V., Senio D. S., Belov I. Yu., Sakhibullin N. A., Astronomy Letters, 39, 111-125, 2013

[19] HBHA 4705-03: A new cataclysmic variable
Yakin D. G., Suleimanov V. F., Vlasyuk V. V., Spiridonova O. I., Astronomy Letters, 39, 38-53, 2013

[20] Radiative properties of magnetic neutron stars with metallic surfaces and thin atmospheres
Potekhin A. Y., Suleimanov V. F., van Adelsberg M., Werner K., Astronomy and Astrophysics, 546, A121 (14pp), 2012

[21] X-ray bursting neutron star atmosphere models using an exact relativistic kinetic equation for Compton scattering
Suleimanov V., Poutanen J., Werner K., Astronomy and Astrophysics, 545, A120 (16pp), 2012

[22] Magnetized Neutron Star Atmospheres: Beyond the Cold Plasma Approximation
Suleimanov V. F., Pavlov G. G., Werner K., Astrophysical Journal, 751, 15 (7pp), 2012

[23] Investigation of the new cataclysmic variable 1RXS J180834.7+101041
Yakin D. G., Suleimanov V. F., Borisov N. V., Shimanskii V. V., Bikmaev I. F., Astronomy Letters, 37, 845 -857, 2011

[24] Absorption Features in Spectra of Magnetized Neutron Stars
V. Suleimanov, V. Hambaryan, A. Y. Potekhin, G. G. Pavlov, M. van Adelsberg, R. Neuhaeuser, K. Werner, American Institute of Physics Conference Series 1379, 195-196, 2011

[25] Phase-resolved spectroscopic study of the isolated neutron star RBS1223
V. Hambaryan, V. Suleimanov, R. Neuhaeuser, K. Werner, American Institute of Physics Conference Series 1379, 119-122, 2011

[26] The origin of RXJ1856.5-3754 and RXJ0720.4-3125 - updated using new parallax measurements
N. Tetzlaff, T. Eisenbeiss, R. Neuhaeuser, M.M. Hohle, Monthly Notices of the Royal Astronomical Society 417, 617-626 (2011)

[27] A catalogue of young runaway stars within 3 kpc from Hipparcos
N. Tetzlaff, R. Neuhaeuser, M.M. Hohle, Monthly Notices of the Royal Astronomical Society 410, 190-200, 2011

[28] Neutron star stiff equation of state derived from cooling phases of the X-ray burster 4U 1724-307
Suleimanov, V., Poutanen, J., Revnivtsev, M., Werner, K., Astrophysical Journal, 742, 122 (12pp), 2011

[29] Phase resolved spectroscopic study of the isolated neutron star RBS 1223 (1RXS J130848.6+212708)
Hambaryan, V., Suleimanov, V., Schwope, A. D., Neuhaeuser, R., Werner, K., Potekhin, A. Y., Astronomy and Astrophysics, 534, 74-80, 2011

[30] Bayesian timing analysis of giant flare of SGR 1806-20 by RXTE PCA
Hambaryan V., Neuhaeuser R., Kokkotas K.D., Astronomy and Astrophysics 528, 45-49, 2011

[31] Eclipses During the 2010 Eruption of the Recurrent Nova U Scorpii
Schaefer, B.E., Pagnotta, A., LaCluyze, A., ... Suleimanov, V. ..., Astrophysical Journal, 742, 113 (20pp), 2011

[32] Vertical structure of the outer accretion disk in persistent low-mass X-ray binaries
Mescheryakov, A.V.; Shakura, N.I.; Suleimanov, V.F., Astronomy Letters 37, 311-331, 2011

[33] Influence of the velocity gradient on the line formation in discs of cataclysmic variables
Korcakova, D., Nagel, T., Werner, K., Suleimanov, V., Votruba, V., Astronomy and Astrophysics 529, A119, 2011

[34] Witnessing the magnetospheric boundary at work in Vela X-1
Doroshenko, V., Santangelo, A., Suleimanov, V., Astronomy and Astrophysics 529, A52, 2011

[35] X-ray bursting neutron star atmosphere models: spectra and color corrections
Suleimanov, V., Poutanen, J., Werner, K., Astronomy and Astrophysics 527, A139, 2011

[36] Dark spot, spiral waves and the SW Sextantis behaviour: it is all about UX Ursae Majori
Neustroev, V.V., Suleimanov, V.F., Borisov, N.V., Belyakov, K.V., Shearer, A., MNRAS 410, 963-977, 2011

[37] IGR J16547-1916/1RXS J165443.5-191620'97a new intermediate polar from the INTEGRAL galactic survey
Lutovinov, A.A.; Burenin, R.A.; Revnivtsev, M.G.; Suleimanov, V.F.; Tkachenko, A. Yu., Astronomy Letters 36, 904-909, 2010

[38] Is there a highly magnetized neutron star in GX 301-2?
Doroshenko, V., Santangelo, A., Suleimanov, V., Kreykenbohm, I., Staubert, R., Ferrigno, C., Klochkov, D., Astronomy and Astrophysics 515, A10, 2010

[39] The Double-degenerate Nucleus of the Planetary Nebula TS 01: A Close Binary Evolution Showcase
Tovmassian, G.,Yungelson, L., Rauch, T., Suleimanov, V. et al., Astrophysical Journal 714, 178-193, 2010

[40] Revisiting the parallx of the isolated neutron star RXJ185635-3754 using HST/ACS imaging
F. M. Walter, T. Eisenbeiss, J. M. Lattimer, B. Kim, V. V. Hambaryan, R. Neuhaeuser, Astrophysical Journal 724, 669-677, 2010

[41] Radiative properties of highly magnetized isolated neutron star surfaces and approximate treatment of absorption features in their spectra.
V. Suleimanov, V. Hambaryan, A.Y. Potekhin, R. Neuhaeuser, K. Werner, K., Astronomy and Astrophysics 522, A111, 2010

[42] Models of magnetized neutron star atmospheres,
Suleimanov, V., Potekhin, A.Y., Werner, K, Adv. Space Res., 45, 92, 2010

[43] Orbital motion of the young brown dwarf companion TWA 5 B
Neuhaeuser, R., Schmidt, T. O. B., Hambaryan, V. V., Vogt, N., Astronomy and Astrophysics 516, 112-116, 2010

[44] Masses and luminosities of O- and B-type stars and red supergiants
Hohle, M. M., Neuhaeuser, R., Schutz, B. F., Astron. Nachrichten, 331, 349, 2010

[45] New photometry and astrometry of the isolated neutron star RX J0720-3125 using recent VLT/FORS observations
Eisenbeiss, T., Ginski, C., Hohle, M. M., Hambaryan, V. V., Neuhaeuser, R., Schmidt, T. O. B., Astron. Nachrichten, 331, 243, 2010

[46] Identifying birth places of young isolated neutron stars
Tetzlaff N., Neuhaeuser R., Hohle M.M. , Maciejewski G., MNRAS 402, 2369-2387, 2010

[47] Multiwavelength properties of a new Geminga-like pulsar: PSRJ2021+4026
Trepl, L., Hui, C.Y., Cheng, K.S., Takata, J., Wang, Y., Liu, Z.Y., Wang, N., MNRAS, 405, 1339

[48] Models of magnetized neutron star atmospheres: thin atmospheres and partially ionized hydrogen atmospheres with vacuum polarization
Suleimanov, V., Potekhin, A.Y., Werner, K, Astronomy and Astrophysics, 500, 891-899, 2009

[49] Non-LTE Model Atmospheres for Supersoft X-ray Sources
Rauch, T., Werner, K, Astron. Nachrichten, in press, 2009

[50] Neutron Star Model Atmospheres
Suleimanov, V., Rauch, T., Werner, K., Potekhin, A.Y., Poutanen, J., in "Recent Directions in Astrophysical Quantitative Spectroscopy and Radiation Hydrodynamics", eds. I. Hubeny, K. Macgregor, J. Stone, K. Werner. AIP Conference Proceedings, in press, 2009

[51] NLTE Model Atmospheres for Super-Soft X-ray Sources
Rauch, T., Werner, K., in "Recent Directions in Astrophysical Quantitative Spectroscopy and Radiation Hydrodynamics", eds. I. Hubeny, K. Macgregor, J. Stone, K. Werner. AIP Conference Proceedings, in press, 2009

[52] The origin of the Guitar pulsar
Tetzlaff N., Neuhaeuser R., Hohle M.M., MNRAS, 400, 99, 2009

[53] Photometric study of the OB star clusters NGC 1502 & NGC 2169 and mass estimation of their members at the University Observatory Jena
Hohle M.M. , Eisenbeiss T., Mugrauer M., Freistetter F., Moualla M., Neuhaeuser R., Raetz S., Schmidt T.O.B., Tetzlaff N., Vanko M., 2009, Astronomische Nachrichten, 330, 518-525

[54] XMM-Newton RGS spectrum of RX J0720.4-3125: An interstellar OVII line at 0.57 keV
Hambaryan V., Neuhaeuser R., Haberl F., Hohle M.M., Schwope A.D., 2009, Astronomy and Astrophysics, 497, L9-L12

[55] Mass Ejection by Strange Star Mergers and Observational Implications
Bauswein A., Janka H., Oechslin R., Pagliara G., Sagert I., Schaffner-Bielich J., Hohle M.M., Neuhaeuser R., 2009, Phys. Rev. Lett. 103, 011101

[56] Searching for sub-stellar companions around young isolated neutron stars
Posselt B., Neuhaeuser R., Haberl F., 2009, Astronomy and Astrophysics, 496, 533-545

[57] Spectral and temporal variations of the isolated neutron star RX J0720.4-3125: new XMM-Newton observations
Hohle, M. M.; Haberl, F.; Vink, J.; Hambaryan, V.; Turolla, R.; Zane, S.; de Vries, C. P.; Mendez, M., Astronomy and Astrophysics, 498, 811

[58] Absorption features in the spectra of X-ray bursting neutron stars
V. Suleimanov, T. Rauch, K. Werner, K., Proc. 12th Marcel Grossmann Meeting

[59] Space cowboys odyssey: beyond the Gould Belt
Popov S.B., Posselt B., Haberl F., Truemper J., Turolla R., Neuhaeuser R., 2008, In: Conf. 40 Years of Pulsars (held in Montreal, Canada, in Aug 2007) AIP Conf. Proc. 983, 357-359

[60] Absorption features in the spectra of X-ray bursting neutron stars.
Rauch T., Suleimanov V., and Werner K., Astronomy & Astrophysics, 2008, 490, 1127

[61] Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars.
Suleimanov V., Poutanen J., Falanga M., and Werner K., Astronomy & Astrophysics, 2008, 491, 525

[62] Modeling of non-stationary accretion disks in X-ray novae A 0620-00 and GRS 1124-68 during outburst.
Suleimanov V. F., Lipunova G. V. and Shakura N. I., Astronomy & Astrophysics, 2008, 491, 267

[63] The XMM-Newton Serendipitous Survey. VI. The Second XMM-Newton Serendipitous Source Catalogue
Watson, M. G. et al. with Hambaryan, V.V., Astronomy & Astrophysics, 2008, 493, 339

[64] The needle in the haystack - Where to look for more isolated cooling neutron stars
B. Posselt, S. B. Popov, F. Haberl, J. Truemper, R. Turolla, R. Neuhaeuser, Astronomy & Astrophysics, 2008, 482, 617-629 (with one figure from our article on front cover page)

[65] Using radioactivities to improve the search for nearby radio-quiet neutron stars
Hohle M.M., Neuhaeuser R., Tetzlaff, N., New Astronomy Reviews, 2008, 52, 7-10, 405-408, (conference paper), editor: Diehl R.

[66] The Corona Australis star-forming region
R. Neuhaeuser and J. Forbrich, Handbook of Low Mass Star Forming Regions, 2008

[67] Searching for planets around pulsars and radio-quiet neutron stars
B. Posselt, R. Neuhaeuser, F. Haberl, AIPC, 983, 360 2008

[68] Towards mass determination of thermal emitting neutron stars by gravitational lensing
T. Eisenbeiss, R. Neuhaeuser, Astronomische Nachrichten, 328, 709 (conference abstract), 2007

[69] New luminosities for O and B stars
M. Hohle, R. Neuhaeuser, Astronomische Nachrichten, 328 Suppl., 713 (conference abstract), 2007

[70] Determination of neutron star masses through orbiting substellar companions
R. Neuhaeuser, B. Posselt, Astronomische Nachrichten, 328 Suppl., 711 (conference abstract), 2007

[71] The Magnificent Seven in the dusty prairie - The role of interstellar absorption
B. Posselt, S. B. Popov, F. Haberl, J. Truemper, R. Turolla, R. Neuhaeuser, Astrophysics & Space Science, 308, 171 (conference proceeding), 2007

[72] The complex X-ray spectrum of the isolated neutron star RBS1223
A. D. Schwope, V. V. Hambaryan, F. Haberl, C. Motch, Astrophysics & Space Science, 308, 619, 2007

Books

[73] On the evolutionary status of Isolated Neutron Stars
V. Hambaryan, R. Neuhaeuser, N. Tetzlaff, M. M. Hohle, Book: Evolution of Cosmic Objects through their Physical Activity, 111-117, 2010

Theses

[74] The spectral and temporal variability of the isolated X-ray pulsar RX J0720.4-3125
Hohle, M. M., PhD Thesis (2011)

[75] Optische Beobachtungen naher Isolierter Neutronensterne
Eisenbeiss, T., PhD Thesis (2011)

[76] Modeling of X-ray sources and their radiation spectra
Suleimanov V. F., Habilitation Thesis, Moscow State University, Russia (2008)