HY Velorum

HY Velorum
	; A visual band light curve for HY Velorum, adapted from Waelkens and Rufener (1985)
Observation data; Epoch J2000 Equinox J2000
Constellation	Vela
Right ascension	08h 42m 25.38667s
Declination	−53° 06′ 50.3324″
Apparent magnitude (V)	4.81 - 4.86
Characteristics
Spectral type	B3 IV
B−V color index	−0.173±0.007
Variable type	SPB
Astrometry
Radial velocity (Rv)	+15.6±0.2 km/s
Proper motion (μ)	RA: −24.83 mas/yr ; Dec.: +23.21 mas/yr
Parallax (π)	7.1141 ± 0.2302 mas
Distance	460 ± 10 ly ; (141 ± 5 pc)
Absolute magnitude (MV)	−1.25
Orbit
Period (P)	8.378±0.001 d
Eccentricity (e)	0.24±0.04
Periastron epoch (T)	2450741.3 ± 0.2 HJD
Argument of periastron (ω); (secondary)	93±9°
Semi-amplitude (K1); (primary)	8.0±0.3 km/s
Details
HY Vel Aa
Mass	5.4 M☉
Luminosity	830+927; −743 L☉
Surface gravity (log g)	4.07 cgs
Temperature	16,865+235; −231 K
Metallicity [Fe/H]	0.03±0.02 dex
Rotational velocity (v sin i)	45 km/s
Age	179 Myr
Other designations
	HY Vel, CPD−52° 1607, HD 74560, HIP 42726, HR 3467, SAO 236205, WDS J08424-5307A
Database references
SIMBAD	data

HY Velorum is a binary star^[7] system in the southern constellation of Vela. It is a dim star but visible to the naked eye with an apparent visual magnitude of 4.83.^[5] The distance to this system, as estimated from its annual parallax shift of 7.1 mas,^[2] is 460 light years. HY Vel most likely forms a gravitationally bound pair with the magnitude 5.45 binary system KT Vel (HD 74535);^[12] both are members of the IC 2391 open cluster.^[13] As of 1998, HY Vel and KT Vel had an angular separation of 76.1″ along a position angle of 311°.^[14]

This is a single-lined spectroscopic binary system with an orbital period of 8.4 days and an eccentricity of 0.24. The visible component has an a sin i value of 0.006 AU, where a is the semimajor axis and i is the (unknown) orbital inclination to the line of sight.

In 1979, Shyam M. Jakate announced the discovery that the star's brightness varies.^[15] It was given its variable star designation, HY Velorum, in 1981.^[16] The primary, which is the variable star, is a slowly pulsating B-type star having at least three pulsational modes, with the dominant mode showing a frequency of 0.64472 cycles per day,^[7] corresponding to the catalogued period of 1.55106 days.^[3] It has a stellar classification of B3 IV, matching a B-type subgiant star.^[4]

References

^ Waelkens, C.; Rufener, F. (November 1985). "Photometric variability of mid-B stars". Astronomy and Astrophysics. 152: 6–14. Bibcode:1985A&A...152....6W. Retrieved 30 April 2022.
^ ^a ^b ^c ^d 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. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ ^a ^b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
^ ^a ^b ^c ^d 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, S2CID 119257644.
^ ^a ^b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c De Cat, P.; Aerts, C.; De Ridder, J.; Kolenberg, K.; Meeus, G.; Decin, L. (2000), "A study of bright southern slowly pulsating B stars. I. Determination of the orbital parameters and of the main frequency of the spectroscopic binaries", Astronomy and Astrophysics, 355: 1015–1030, Bibcode:2000A&A...355.1015D.
^ ^a ^b ^c ^d Szewczuk, W.; Daszyńska-Daszkiewicz, J. (June 2015), "Identification of pulsational modes in rotating slowly pulsating B-type stars", Monthly Notices of the Royal Astronomical Society, 450 (2): 1585–1603, arXiv:1504.04490, Bibcode:2015MNRAS.450.1585S, doi:10.1093/mnras/stv715, S2CID 119194953.
^ ^a ^b Niemczura, E. (June 2003), "Metallicities of the SPB stars from the IUE ultraviolet spectra", Astronomy and Astrophysics, 404 (2): 689–700, Bibcode:2003A&A...404..689N, doi:10.1051/0004-6361:20030546.
^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
^ "HD 74560". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 August 2018.
^ 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, S2CID 14878976.
^ Dodd, R. J. (April 2007), "Unified Absolute Spectrophotometry for Star Clusters", in Sterken, C. (ed.), The Future of Photometric, Spectrophotometric and Polarimetric Standardization. Proceedings of a conference held 8-11 May, 2006 in Blankenberge, Belgium, ASP Conference Series, vol. 364, San Francisco: Astronomical Society of the Pacific, p. 237, Bibcode:2007ASPC..364..237D.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
^ Jakate, S. M. (April 1979). "A search for Beta Cephei stars. III. Photometric studies of southern B-type stars". Astronomical Journal. 84: 552–558. Bibcode:1979AJ.....84..552J. doi:10.1086/112448. Retrieved 23 December 2024.
^ Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). "65th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1921. Bibcode:1981IBVS.1921....1K. Retrieved 23 December 2024.

[Waelkens-1] Waelkens, C.; Rufener, F. (November 1985). "Photometric variability of mid-B stars". Astronomy and Astrophysics. 152: 6–14. Bibcode:1985A&A...152....6W. Retrieved 30 April 2022.

[GaiaDR2-2] 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. Gaia DR2 record for this source at VizieR.

[gcvs-3] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

[houk1978-4] Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.

[Anderson2012-5] 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, S2CID 119257644.

[vanLeeuwen2007-6] van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

[DeCat2000-7] De Cat, P.; Aerts, C.; De Ridder, J.; Kolenberg, K.; Meeus, G.; Decin, L. (2000), "A study of bright southern slowly pulsating B stars. I. Determination of the orbital parameters and of the main frequency of the spectroscopic binaries", Astronomy and Astrophysics, 355: 1015–1030, Bibcode:2000A&A...355.1015D.

[Szewczuk2015-8] Szewczuk, W.; Daszyńska-Daszkiewicz, J. (June 2015), "Identification of pulsational modes in rotating slowly pulsating B-type stars", Monthly Notices of the Royal Astronomical Society, 450 (2): 1585–1603, arXiv:1504.04490, Bibcode:2015MNRAS.450.1585S, doi:10.1093/mnras/stv715, S2CID 119194953.

[Niemczura2003-9] Niemczura, E. (June 2003), "Metallicities of the SPB stars from the IUE ultraviolet spectra", Astronomy and Astrophysics, 404 (2): 689–700, Bibcode:2003A&A...404..689N, doi:10.1051/0004-6361:20030546.

[Gontcharov2012-10] Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.

[SIMBAD-11] "HD 74560". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 August 2018.

[Eggleton2008-12] 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, S2CID 14878976.

[Dodd2007-13] Dodd, R. J. (April 2007), "Unified Absolute Spectrophotometry for Star Clusters", in Sterken, C. (ed.), The Future of Photometric, Spectrophotometric and Polarimetric Standardization. Proceedings of a conference held 8-11 May, 2006 in Blankenberge, Belgium, ASP Conference Series, vol. 364, San Francisco: Astronomical Society of the Pacific, p. 237, Bibcode:2007ASPC..364..237D.

[WDSC2014-14] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920

[Jakate1979-15] Jakate, S. M. (April 1979). "A search for Beta Cephei stars. III. Photometric studies of southern B-type stars". Astronomical Journal. 84: 552–558. Bibcode:1979AJ.....84..552J. doi:10.1086/112448. Retrieved 23 December 2024.

[Kholopov1981-16] Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). "65th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1921. Bibcode:1981IBVS.1921....1K. Retrieved 23 December 2024.

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HY Velorum

References

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