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)
| Thomas Eisenbeiss | Postdoc, 2011 | ||
| Valeri Hambaryan | Postdoc, 2007 | ||
| Markus Hohle | Postdoc, 2011 | ||
| Ralph Neuhaeuser | Professor, PI 2007 | ||
| Valery Suleymanov | Postdoc, 2007 | ||
| Nina Tetzlaff | PhD Student, 2009 | ||
| Klaus Werner | Professor, PI 2007 | ||
Former Associates | |||
| Ludwig Trepl | PhD Student, 2009-2010 | ||
| Thomas Eisenbeiss | PhD Student, 2007-2011 | ||
| Markus Hohle | PhD Student, 2007-2011 |
[1]
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
[2]
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
[3]
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, in press (2011arXiv1107.1673T)
[4]
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
[5]
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.,
ApJ, (accepted for publication) 2011
[6]
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, A74, 2011
[7]
Eclipses During the 2010 Eruption of the Recurrent Nova U Scorpii
Schaefer, B.E., Pagnotta, A., LaCluyze, A., Suleimanov, V.,
ApJ, (accepted for publication) 2011
[8]
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
[9]
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
[10]
Witnessing the magnetospheric boundary at work in Vela X-1
Doroshenko, V., Santangelo, A., Suleimanov, V.,
Astronomy and Astrophysics 529, A52, 2011
[11]
X-ray bursting neutron star atmosphere models: spectra and color corrections
Suleimanov, V., Poutanen, J., Werner, K.,
Astronomy and Astrophysics 527, A139, 2011
[12]
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
[13]
IGR J16547-1916/1RXS J165443.5-191620—a 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
[14]
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
[15]
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
[16]
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
[17]
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
[18]
Models of magnetized neutron star atmospheres,
Suleimanov, V., Potekhin, A.Y., Werner, K,
Adv. Space Res., 45, 92, 2010
[19]
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
[20]
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
[21]
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
[22]
Identifying birth places of young isolated neutron stars
Tetzlaff N., Neuhaeuser R., Hohle M.M. , Maciejewski G.,
MNRAS 402, 2369-2387, 2010
[23]
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
[24]
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
[25]
Non-LTE Model Atmospheres for Supersoft X-ray Sources
Rauch, T., Werner, K,
Astron. Nachrichten, in press, 2009
[26]
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
[27]
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
[28]
The origin of the Guitar pulsar
Tetzlaff N., Neuhaeuser R., Hohle M.M.,
MNRAS, 400, 99, 2009
[29]
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
[30]
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
[31]
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
[32]
Searching for sub-stellar companions around young isolated neutron stars
Posselt B., Neuhaeuser R., Haberl F., 2009,
Astronomy and Astrophysics, 496, 533-545
[33]
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
[34]
Absorption features in the spectra of X-ray bursting neutron stars
V. Suleimanov, T. Rauch, K. Werner, K.,
Proc. 12th Marcel Grossmann Meeting
[35]
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
[36]
Absorption features in the spectra of X-ray bursting neutron stars.
Rauch T., Suleimanov V., and Werner K.,
Astronomy & Astrophysics, 2008, 490, 1127
[37]
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
[38]
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
[39]
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
[40]
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)
[41]
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.
[42]
The Corona Australis star-forming region
R. Neuhaeuser and J. Forbrich,
Handbook of Low Mass Star Forming Regions, 2008
[43]
Searching for planets around pulsars and radio-quiet neutron stars
B. Posselt, R. Neuhaeuser, F. Haberl,
AIPC, 983, 360 2008
[44]
Towards mass determination of thermal emitting neutron stars by gravitational lensing
T. Eisenbeiss, R. Neuhaeuser,
Astronomische Nachrichten, 328, 709 (conference abstract), 2007
[45]
New luminosities for O and B stars
M. Hohle, R. Neuhaeuser,
Astronomische Nachrichten, 328 Suppl., 713 (conference abstract), 2007
[46]
Determination of neutron star masses through orbiting substellar companions
R. Neuhaeuser, B. Posselt,
Astronomische Nachrichten, 328 Suppl., 711 (conference abstract), 2007
[47]
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
[48]
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
[49]
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