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38 Geminorum

This article is about e Geminorum. Not to be confused with ε (epsilon) Geminorum.
38 Geminorum

A light curve for 38 Geminorum plotted from TESS data[1]
Observation data
Epoch 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] + G6V[5]
U−B color index +0.07[6]
B−V color index +0.30[6]
Variable type Suspected δ Sct[7]
Astrometry
A
Radial velocity (Rv)+24±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]
Distance96 ± 2 ly
(29.5 ± 0.7 pc)
B
Radial velocity (Rv)+22.6±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]
Distance97.9 ± 0.2 ly
(30.00 ± 0.08 pc)
Details
38 Gem A
Mass1.55[11] M☉
Surface gravity (log g)4.23[12] cgs
Temperature7,410±252[12] K
Metallicity [Fe/H]−0.08±0.06[13] dex
Rotational velocity (v sin i)147.5±10.5[14] km/s
Age1.179[12] Gyr
38 Gem B
Mass0.89[11] M☉
Radius0.89[10] R☉
Luminosity0.694[10] L☉
Temperature5,583[10] K
Other designations
e Gem, 38 Gem, NSV 3266, BD+13°1462, GJ 9220, HD 50635, HIP 33202, HR 2564, SAO 96265, WDS J06546+1311
Database references
SIMBADdata
A
B

38 Geminorum is a binary star system in the northern zodiac constellation of Gemini. It has the Bayer designation e Geminorum, while 38 Geminorum is the Flamsteed designation. This system is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.71. The primary component is a magnitude 4.75 star, while the secondary is magnitude 7.80.[3] The system is located about 98 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +16 km/s.[15] It is a potential member of the Tucana–Horologium stellar kinematic group.[16]

This is a wide binary system with a projected separation of 184.3 AU.[11] Two sets of low quality orbital elements have been computed for this system, yielding periods of 1,943.8 years and 3,190 years, and eccentricities of 0.150 and 0.485, respectively.[17] As of 2018, the pair had an angular separation of 7.4″ along a position angle of 143°.[3]

Abt and Morrell (1995) classified the primary component as an A-type main-sequence star with a stellar classification of A8V.[4] It is a suspected chemically peculiar star of subtype CP1 (an Am star),[14] which Slettebak (1955) classified as kA8mF0Vp.[18] This notation indicates the star displays the calcium K line of an A8 star and the metal lines of an F0V star. In 1949, J. Hopmann catalogued it as a suspected Delta Scuti variable.[7] The secondary is a G-type main-sequence star with a class of G6V.[5]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference HIP was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Abt was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Adams1935 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Johnson was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Starikova1979 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference rv was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference dr2a was invoked but never defined (see the help page).
  10. ^ a b c d e f Cite error: The named reference dr2b was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference gaspar2016 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Paunzen2013 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference nakajima2012 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference apj629_1_507 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Slettebak1955 was invoked but never defined (see the help page).
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