Binary star system in the constellation Gemini
38 Geminorum Observation dataEpoch J2000 Equinox J2000 Constellation Gemini Right ascension 06h 54m 38.63478s [ 2] Declination +13° 10′ 40.2207″[ 2] Apparent magnitude (V)4.75 + 7.80 [ 3] Characteristics Spectral type A8V[ 4] [ 5] U−Bcolor index +0.07[ 6] B−Vcolor index +0.30[ 6] Variable type Suspected δ Sct [ 7] Astrometry A Radial velocity (Rv )± 5[ 8] km/s Proper motion (μ)RA: 68.745[ 9] mas /yr Dec.: −86.832[ 9] mas /yr Parallax (π)33.9184± 0.8248 mas [ 9] Distance 96 ± 2 ly pc ) B Radial velocity (Rv )± 2[ 8] km/s Proper motion (μ)RA: 89.235[ 10] mas /yr Dec.: −77.171[ 10] mas /yr Parallax (π)33.3308 ± 0.0847 mas [ 10] Distance 97.9 ± 0.2 ly pc ) Details 38 Gem A Mass 1.55[ 11] M ☉ Surface gravity (log g )4.23[ 12] cgs Temperature ± 252[ 12] K Metallicity ± 0.06[ 13] dex Rotational velocity (v sin i )± 10.5[ 14] Age 1.179[ 12] Gyr 38 Gem B Mass 0.89[ 11] M ☉ Radius 0.89[ 10] R ☉ Luminosity 0.694[ 10] L ☉ Temperature 5,583[ 10] K Other designations e Gem ,38 Gem ,NSV 3266BD +13°1462GJ 9220HD 50635HIP 33202HR 2564SAO 96265WDS J06546+1311Database references SIMBAD data A B
38 Geminorum is abinary star system in the northernzodiac constellation ofGemini . It has theBayer designation e Geminorum , while38 Geminorum is theFlamsteed designation . This system is visible to the naked eye as a faint, white-hued point of light with anapparent visual magnitude of 4.71. The primary component is a magnitude 4.75 star, while the secondary is magnitude 7.80.[ 3] light years away from the Sun based onparallax , and is drifting further away with aradial velocity of +16 km/s.[ 15] Tucana–Horologium stellar kinematic group .[ 16]
This is a wide binary system with aprojected separation ofAU [ 11] orbital elements have been computed for this system, yieldingperiods of 1,943.8 years and 3,190 years, andeccentricities of 0.150 and 0.485, respectively.[ 17] angular separation of″ position angle of 143°.[ 3]
Abt and Morrell (1995) classified the primary component as anA-type main-sequence star with astellar classification of A8V.[ 4] chemically peculiar star of subtype CP1 (anAm star ),[ 14] [ 18] calcium K line of anA8 star and themetal lines of anF0V star . In 1949, J. Hopmann catalogued it as a suspectedDelta Scuti variable .[ 7] G-type main-sequence star with a class of G6V.[ 5]
^ "MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute. Retrieved11 September 2024 .^a b 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 .S2CID 18759600 . ^a b c 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 ^a b Abt, Helmut A.; Morrell, Nidia I. (1995)."The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars" .The Astrophysical Journal Supplement Series .99 : 135.Bibcode :1995ApJS...99..135A .doi :10.1086/192182 ^a b Adams, Walter S.; et al. (1935)."The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars" .Astrophysical Journal .81 : 187.Bibcode :1935ApJ....81..187A .doi :10.1086/143628 ^a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars".Communications of the Lunar and Planetary Laboratory .4 : 99.Bibcode :1966CoLPL...4...99J . ^a b Starikova, G. A. (July 1979). "Absolute magnitudes and masses for three types of variable stars".Soviet Astronomy Letters .5 :188– 192.Bibcode :1979SvAL....5..188S . ^a b Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities".Determination of Radial Velocities and Their Applications .30 : 57.Bibcode :1967IAUS...30...57E . ^a b c 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 atVizieR .^a b c d e f 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 atVizieR .^a b c Tokovinin, A.; Kiyaeva, O. (February 2016)."Eccentricity distribution of wide binaries" .Monthly Notices of the Royal Astronomical Society .456 (2):2070– 2079.arXiv :1512.00278 Bibcode :2016MNRAS.456.2070T .doi :10.1093/mnras/stv2825 S2CID 1615080 . ^a b c David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets".The Astrophysical Journal .804 (2): 146.arXiv :1501.03154 Bibcode :2015ApJ...804..146D .doi :10.1088/0004-637X/804/2/146 .S2CID 33401607 . ^ Gáspár, András; et al. (2016)."The Correlation between Metallicity and Debris Disk Mass" .The Astrophysical Journal .826 (2): 171.arXiv :1604.07403 Bibcode :2016ApJ...826..171G .doi :10.3847/0004-637X/826/2/171 S2CID 119241004 . ^a b Paunzen, E.; et al. (February 2013)."A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars" .Monthly Notices of the Royal Astronomical Society .429 (1):119– 125.arXiv :1211.1535 Bibcode :2013MNRAS.429..119P .doi :10.1093/mnras/sts318 S2CID 119231581 . ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system".Astronomy Letters .32 (11):759– 771.arXiv :1606.08053 Bibcode :2006AstL...32..759G .doi :10.1134/S1063773706110065 .S2CID 119231169 . ^ Nakajima, Tadashi; Morino, Jun-Ichi (2012)."Potential Members of Stellar Kinematic Groups within 30 pc of the Sun" .The Astronomical Journal .143 (1): 2.Bibcode :2012AJ....143....2N .doi :10.1088/0004-6256/143/1/2 ^ Abt, Helmut A. (August 2005)."Observed Orbital Eccentricities" .The Astrophysical Journal .629 (1):507– 511.Bibcode :2005ApJ...629..507A .doi :10.1086/431207 ^ Slettebak, Arne (May 1955)."The Spectra and Rotational Velocities of the Bright Stars of Draper Types A3-G0" .Astrophysical Journal .121 : 653.Bibcode :1955ApJ...121..653S .doi :10.1086/146031
