NSVS 14256825

NSVS 14256825, also known as V1828 Aquilae, is an eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises an eclipsing subdwarf OB star and red dwarf star. The two stars orbit each other every 2.648976 hours.[4] Based on the stellar parallax of the system, observed by Gaia, the system is located approximately 2,700 light-years (840 parsecs) away.[1]

NSVS 14256825
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 20h 20m 00.45867s[1]
Declination +04° 37′ 56.5198″[1]
Apparent magnitude (V) 13.2[2]
Characteristics
Spectral type sdOB / M V[2]
Astrometry
Radial velocity (Rv)12.10 ± 1.5[3] km/s
Proper motion (μ) RA: 8.063[1] mas/yr
Dec.: 1.133[1] mas/yr
Parallax (π)1.1929 ± 0.0599[1] mas
Distance2,700 ± 100 ly
(840 ± 40 pc)
Orbit[4]
Period (P)0.110374230 d
Inclination (i)82.5°
Periastron epoch (T)2454274.20874 JD
Details[2]
Mass0.528 M☉
Temperature42000 K
Other designations
V1828 Aql, 2MASS J20200045+0437564[5]
Database references
SIMBADdata

Eclipse timing variations

Based on variations in the timing of the system's eclipses, in 2012 it was claimed that two giant planets were in orbit around the binary, with masses of 2.9 and 8.1 times the mass of Jupiter orbiting with periods of 3.5 and 6.9 years respectively.[4] The proposed system was later shown to be extremely unstable, lasting less than a thousand years (i.e., much shorter than the age of the system); more observations are needed.

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. "Notes on NSVS 1425 (AB) b". Retrieved 26 November 2016.
  3. Kupfer, T.; Geier, S.; Heber, U.; Østensen, R. H.; Barlow, B. N.; Maxted, P. F. L.; Heuser, C.; Schaffenroth, V.; Gänsicke, B. T. (2015). "Hot subdwarf binaries from the MUCHFUSS project. Analysis of 12 new systems and a study of the short-period binary population". Astronomy and Astrophysics. 576: A44. arXiv:1501.03692. Bibcode:2015A&A...576A..44K. doi:10.1051/0004-6361/201425213. S2CID 53724563.
  4. Almeida, L. A.; Jablonski, F.; Tello, J.; Rodrigues, C. V. (2012). "A photometric and spectroscopic study of NSVS 14256825: the second sdOB+dM eclipsing binary". Monthly Notices of the Royal Astronomical Society. 423 (1): 478–485. arXiv:1203.1266. Bibcode:2012MNRAS.423..478A. doi:10.1111/j.1365-2966.2012.20891.x. S2CID 119177743.
  5. "NSVS 14256825". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-16.


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