HD 40979 Triple star system in the constellation Auriga
HD 40979
Observation dataEpoch J2000 Equinox J2000
Constellation Auriga [ 1]
Right ascension 06h 04m 29.94314s [ 2]
Declination +44° 15′ 37.5939″ [ 2]
Apparent magnitude (V)6.74[ 1] [ 3]
Characteristics
Evolutionary stage main sequence [ 2]
Spectral type F7V[ 4]
Apparent magnitude (G)
6.62[ 2]
B−V color index
± 0.007[ 1]
Astrometry Radial velocity (Rv )± 0.13[ 2] km/s Proper motion (μ) RA: ± 0.021[ 2] mas /yr Dec.: ± 0.017[ 2] mas /yr Parallax (π)29.4299± 0.0213 mas [ 2] Distance 110.82 ± 0.08 ly pc ) Absolute magnitude (MV )4.14[ 1] Details A Mass 1.21[ 5] [ 6] M ☉ Radius ± 0.03[ 7] R ☉ Luminosity +0.003 [ 7] L ☉ Surface gravity (log g )4.35[ 8] cgs Temperature +82 [ 7] K Metallicity [Fe/H] 1.14[ 8] dex Rotational velocity (v sin i )9.1[ 8] km/s Age 2.51[ 8] Gyr B Mass ± 0.011[ 5] M ☉ Radius 0.78[ 9] R ☉ Luminosity 0.301[ 9] L ☉ Surface gravity (log g )4.35[ 10] cgs Temperature 4,992[ 10] K Metallicity [Fe/H] 0.12[ 10] dex Rotational velocity (v sin i )± 2.2[ 10] km/sOther designations BD +44°1353GC 7670HD 40979HIP 28767SAO 40830PPM 48712WDS J06045+4416AGSC 02937-017472MASS J06042993+4415379[ 11] Database references SIMBAD data
HD 40979 is a triple star [ 5] constellation of Auriga . The combined brightness of this group lies below the typical limit of visibility to the naked eye at an apparent visual magnitude of 6.74.[ 1] light years from the Sun based on parallax .[ 2] radial velocity of +32 km/s.[ 2] proper motion , traversing the celestial sphere at the rate of ″ [ 12]
The primary, designated component A, is an F-type main-sequence star with a stellar classification of F7V.[ 4] [ 8] billion years old and is spinning with a projected rotational velocity of 9.1[ 8] km/s. The star has 1.21[ 5] mass of the Sun and 1.26[ 7] Sun's radius . It has a higher metallicity than the Sun[ 8] atomic number than helium. The star is radiating 1.96[ 7] luminosity of the Sun from its photosphere at an effective temperature of 6,077 K.[ 7] extrasolar planet known to be orbiting around this star.[ 13] infrared excess suggests a debris disk is orbiting the star at a separation of AU K.[ 14]
The magnitude 9.11[ 3] angular separation of ″ projected separation of around AU [ 5] [ 3] ± 0.013″position angle of ± 0.178° AU[ 5] [ 5]
References
1 2 3 4 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 . XHIP record for this object at VizieR .1 2 3 4 5 6 7 8 9 10 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A& A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .1 2 3 Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog" . The Astronomical Journal . 122 (6): 3466. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 1 2 Abt, Helmut A. (November 2004). "Spectral Classification of Stars in A Supplement to the Bright Star Catalogue" . The Astrophysical Journal Supplement Series . 155 (1): 175– 177. Bibcode :2004ApJS..155..175A . doi :10.1086/423803 1 2 3 4 5 6 7 Mugrauer, M.; et al. (July 2007). "The multiplicity of exoplanet host stars. Spectroscopic confirmation of the companions GJ 3021 B and HD 27442 B, one new planet host triple-star system, and global statistics". Astronomy and Astrophysics . 469 (2): 755– 770. arXiv :astro-ph/0703795 Bibcode :2007A& A...469..755M . doi :10.1051/0004-6361:20065883 . S2CID 204926851 . ↑ Stassun, Keivan G.; et al. (March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes" . The Astronomical Journal . 153 (3): 20. arXiv :1609.04389 Bibcode :2017AJ....153..136S . doi :10.3847/1538-3881/aa5df3 S2CID 119219062 . 136. 1 2 3 4 5 6 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 .1 2 3 4 5 6 7 Luck, R. Earle (January 2017). "Abundances in the Local Region II. F, G, and K Dwarfs and Subgiants" . The Astronomical Journal . 153 (1): 19. arXiv :1611.02897 Bibcode :2017AJ....153...21L . doi :10.3847/1538-3881/153/1/21 S2CID 119511744 . 21. 1 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 .1 2 3 4 Guillout, P.; et al. (September 2009). "A spectroscopic survey of the youngest field stars in the solar neighbourhood. I. The optically bright sample". Astronomy and Astrophysics . 504 (3): 829– 843. arXiv :0907.1157 Bibcode :2009A& A...504..829G . doi :10.1051/0004-6361/200811313 . S2CID 15723883 . ↑ "HD 40979" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2020-01-01 .↑ Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal . 129 (3): 1483– 1522. arXiv :astro-ph/0412070 Bibcode :2005AJ....129.1483L . doi :10.1086/427854 . S2CID 2603568 . 1 2 Fischer, Debra A.; et al. (April 2003). "A Planetary Companion to HD 40979 and Additional Planets Orbiting HD 12661 and HD 38529" . The Astrophysical Journal . 586 (2): 1394– 1408. Bibcode :2003ApJ...586.1394F . doi :10.1086/367889 ↑ Cotten, Tara H.; Song, Inseok (July 2016). "A Comprehensive Census of Nearby Infrared Excess Stars" . The Astrophysical Journal Supplement Series . 225 (1): 24. arXiv :1606.01134 Bibcode :2016ApJS..225...15C . doi :10.3847/0067-0049/225/1/15 S2CID 118438871 . 15. ↑ Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal . 646 (1): 505– 522. arXiv :astro-ph/0607493 Bibcode :2006ApJ...646..505B . doi :10.1086/504701 . S2CID 119067572 .
