التفاصيل البيبلوغرافية
| العنوان: |
A Metal-rich Low-gravity Companion to a Massive Millisecond Pulsar |
| المؤلفون: |
Kaplan, D. L., Bhalerao, V. B., van Kerkwijk, M. H., Koester, D., Kulkarni, S. R., Stovall, K. |
| المصدر: |
Astrophysical Journal, 765(2), Art. No. 158, (2013-03-10) |
| بيانات النشر: |
American Astronomical Society |
| سنة النشر: |
2013 |
| المجموعة: |
Caltech Authors (California Institute of Technology) |
| مصطلحات موضوعية: |
binaries: eclipsing, pulsars: individual (PSR J1816+4510), stars: atmospheres, stars: chemically peculiar, subdwarfs |
| الوصف: |
Most millisecond pulsars with low-mass companions are in systems with either helium-core white dwarfs or non-degenerate ("black widow" or "redback") stars. A candidate counterpart to PSR J1816+4510 was identified by Kaplan et al. whose properties were suggestive of both types of companions although identical to neither. We have assembled optical spectroscopy of the candidate companion and confirm that it is part of the binary system with a radial velocity amplitude of 343 ± 7 km s^(–1), implying a high pulsar mass, M_(psr)sin^3_i = 1.84 ± 0.11 M_☉, and a companion mass M_c sin^3_i = 0.193 ± 0.012 M_☉, where i is the inclination of the orbit. The companion appears similar to proto-white dwarfs/sdB stars, with a gravity log_(10)(g) = 4.9 ± 0.3, and effective temperature 16, 000 ± 500 K. The strongest lines in the spectrum are from hydrogen, but numerous lines from helium, calcium, silicon, and magnesium are present as well, with implied abundances of roughly 10 times solar (relative to hydrogen). As such, while from the spectrum the companion to PSR J1816+4510 is superficially most similar to a low-mass white dwarf, it has much lower gravity, is substantially larger, and shows substantial metals. Furthermore, it is able to produce ionized gas eclipses, which had previously been seen only for low-mass, non-degenerate companions in redback or black widow systems. We discuss the companion in relation to other sources, but find that we understand neither its nature nor its origins. Thus, the system is interesting for understanding unusual stellar products of binary evolution, as well as, independent of its nature, for determining neutron-star masses. ; © 2013 American Astronomical Society. Received 2012 December 29; accepted 2013 January 23; published 2013 February 27. Partially based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de AstrofÃsica de Canarias. Some ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
eprintid:37798 |
| DOI: |
10.1088/0004-637X/765/2/158 |
| الاتاحة: |
https://doi.org/10.1088/0004-637X/765/2/158 |
| Rights: |
info:eu-repo/semantics/openAccess ; Other |
| رقم الانضمام: |
edsbas.684CBDE4 |
| قاعدة البيانات: |
BASE |