HD 35984

HD 35984
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 29m 40.65401s
Declination	+29° 11′ 11.2751″
Apparent magnitude (V)	6.20
Characteristics
Spectral type	F6III
U−B color index	+0.02
B−V color index	+0.45
Astrometry
Radial velocity (Rv)	+13.58 km/s
Proper motion (μ)	RA: 28.45 mas/yr ; Dec.: -46.43 mas/yr
Parallax (π)	11.27 ± 0.59 mas
Distance	290 ± 20 ly ; (89 ± 5 pc)
Absolute magnitude (MV)	1.50
Details
Mass	1.76 M☉
Luminosity	1.32 L☉
Surface gravity (log g)	4.18 cgs
Temperature	6,939 K
Metallicity [Fe/H]	0.19 dex
Rotational velocity (v sin i)	40 km/s
Age	1.26±0.12 Gyr
Other designations
	BD+29° 909, HD 35984, HIP 25730, HR 1822, SAO 77205.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue,; CCDM (2002),; Bright Star Catalogue (5th rev. ed.)

HD 35984 is star in the northern constellation Auriga. It has an apparent magnitude of 6.20,^[2] which, according to the Bortle scale, indicates it is faintly visible to the naked eye from dark rural skies. Parallax measurements by the Hipparcos satellite indicates it lies at a distance of roughly 290 light years away.^[1]

A stellar classification of F6III suggests that this is an evolved giant star that has consumed the supply of hydrogen at its core.^[2] However, X-ray emission, variations in luminosity, and levels of lithium may indicate that this is instead a weak-lined T Tauri star. That is, a low mass pre-main sequence star that is relatively poor in circumstellar matter.^[7]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (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
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194
^ ^a ^b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
^ Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191
^ Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory. University of Kyoto. Bibcode:1970crvs.book.....U.
^ Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, Bibcode:2013A&A...551L...8P, doi:10.1051/0004-6361/201220364, L8
^ Li, J. Z.; Hu, J. Y. (October 1998), "Newly discovered candidate weak-line T Tauri stars in the surrounding area of the Taurus-Auriga region", Astronomy and Astrophysics Supplement, 132: 173−179, Bibcode:1998A&AS..132..173L, doi:10.1051/aas:1998288

External links

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[van_Leeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (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

[aj133_6_2464-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Luck, R. Earle; Heiter, Ulrike (June 2007), "Giants in the Local Region", The Astronomical Journal, 133 (6): 2464–2486, Bibcode:2007AJ....133.2464L, doi:10.1086/513194

[MERMILLIOD-3] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M

[cgssn09-4] Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191

[uesugi_fukuda70-5] Uesugi, Akira; Fukuda, Ichiro (1970). "Catalogue of rotational velocities of the stars". Contributions from the Institute of Astrophysics and Kwasan Observatory. University of Kyoto. Bibcode:1970crvs.book.....U.

[aa551_L8-6] Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, Bibcode:2013A&A...551L...8P, doi:10.1051/0004-6361/201220364, L8

[aas132_173-7] Li, J. Z.; Hu, J. Y. (October 1998), "Newly discovered candidate weak-line T Tauri stars in the surrounding area of the Taurus-Auriga region", Astronomy and Astrophysics Supplement, 132: 173−179, Bibcode:1998A&AS..132..173L, doi:10.1051/aas:1998288

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Observation data Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05^h 29^m 40.65401^s^[1]
Declination	+29° 11′ 11.2751″^[1]
Apparent magnitude (V)	6.20^[2]
Characteristics
Spectral type	F6III^[2]
U−B color index	+0.02^[3]
B−V color index	+0.45^[3]
Astrometry

Radial velocity (R_v)	+13.58^[2] km/s
Proper motion (μ)	RA: 28.45^[1] mas/yr Dec.: -46.43^[1] mas/yr
Parallax (π)	11.27 ± 0.59 mas^[1]
Distance	290 ± 20 ly (89 ± 5 pc)
Absolute magnitude (M_V)	1.50^[4]

Details

Mass	1.76^[2] `M`_☉
Luminosity	1.32^[2] `L`_☉
Surface gravity (log g)	4.18^[2] cgs
Temperature	6,939^[2] K
Metallicity [Fe/H]	0.19^[2] dex
Rotational velocity (v sin i)	40^[5] km/s
Age	1.26±0.12^[6] Gyr

Other designations
BD+29° 909, HD 35984, HIP 25730, HR 1822, SAO 77205.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)