HD 29573

HD 29573 is a binary star[3] system in the constellation Eridanus. It has a combined apparent visual magnitude of 4.99,[2] making it visible to the naked eye. Based upon an annual parallax shift of 15 mass,[1] it is located 217 light years from the Sun. The system is moving further away from Earth with a heliocentric radial velocity of +3 km/s.[5]

HD 24160

Observation data Epoch J2000      Equinox J2000
Constellation	Eridanus
Right ascension	04^h 38^m 53.55464^s[1]
Declination	−12° 07′ 23.2277″[1]
Apparent magnitude (V)	4.99[2] (5.19 + 7.22)[3]
Characteristics
Spectral type	A0 V (A1 + F2)[2]
B−V color index	0.074±0.003[4]
Astrometry
Radial velocity (Rv)	+2.9±0.8[5] km/s
Proper motion (μ)	RA: −44.841[1] mas/yr Dec.: −50.421[1] mas/yr
Parallax (π)	15.0389 ± 0.2211[1] mas
Distance	217 ± 3 ly (66.5 ± 1.0 pc)
Absolute magnitude (MV)	0.73[4]
Orbit[2]
Period (P)	40.9±1.386 yr
Semi-major axis (a)	0.2844±0.0055″
Eccentricity (e)	0.759±0.180
Inclination (i)	75.5±2.2°
Longitude of the node (Ω)	152.0±1.8°
Periastron epoch (T)	2003.805
Argument of periastron (ω) (secondary)	284.1±11.0°
Details
HD 29573 A
Mass	2.28[2] M☉
Luminosity	51.8+4.6 −4.3[6] L☉
Temperature	8,892+103 −102[6] K
Rotational velocity (v sin i)	27[6] km/s
HD 29573 B
Mass	1.56[2] M☉
Other designations
BD−12° 955, GJ 9161, HD 29573, HIP 21644, HR 1483, SAO 149789, WDS J04389-1207AB[7]
Database references
SIMBAD	data

The binary nature of this system was discovered through observations made with the Hipparcos spacecraft. The pair orbit each other with a period of 41 years and an eccentricity of 0.8.[2] The magnitude 5.19[3] primary component has a class of A1,[2] 2.28[2] times the mass of the Sun, and is a suspected chemically peculiar star.[8] The secondary has magnitude 7.22,[3] 1.56[2] times the Sun's mass, and a class of F2.[2] The system has a possible infrared excess[9] due to circumstellar dust.[10]

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. Cvetković, Z.; et al. (March 2014), "Orbits for Eight Hipparcos Double Stars", The Astronomical Journal, 147 (3): 9, Bibcode:2014AJ....147...62C, doi:10.1088/0004-6256/147/3/62, 62.
3. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
4. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
6. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
7. "HD 29573". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-23.
8. Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars" (PDF), Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
9. Shylaja, B. S.; Ashok, N. M. (June 2002), "IR observations of Am stars", Bulletin of the Astronomical Society of India, 30: 491–500, Bibcode:2002BASI...30..491S.
10. Kamp, I.; et al. (June 2002), "Do dusty A stars exhibit accretion signatures in their photospheres?", Astronomy and Astrophysics, 388 (3): 978–984, arXiv:astro-ph/0204449, Bibcode:2002A&A...388..978K, doi:10.1051/0004-6361:20020493.