DR Chamaeleontis

DR Chamaeleontis

A light curve for DR Chamaeleontis, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 41m 51.52042s[2]
Declination −79° 46′ 59.8372″[2]
Apparent magnitude (V) 5.97[3] (5.97 - 6.06)[4]
Characteristics
Spectral type B5 IV[5] or B5 III[6]
U−B color index −0.51[7]
B−V color index −0.07[7]
Variable type Eclipsing binary[8]
Astrometry
Radial velocity (Rv)18±10[9] km/s
Proper motion (μ) RA: −16.877 mas/yr[2]
Dec.: +6.079 mas/yr[2]
Parallax (π)3.0765 ± 0.0439 mas[2]
Distance1,060 ± 20 ly
(325 ± 5 pc)
Absolute magnitude (MV)−1.28[10]
Details
Mass6±0.1[11] M☉
Radius6.48[12] R☉
Luminosity (bolometric)1,587[13] L☉
Surface gravity (log g)3.44[14] cgs
Temperature12,039±190[15] K
Metallicity [Fe/H]+0.08[14] dex
Rotational velocity (v sin i)70±7[16] km/s
Age50±11[11] Myr
Other designations
24 G. Chamaeleontis[17], DR Cha, CD−79°439, CPD−79°548, GC 14758, HD 93237, HIP 52340, HR 4206, SAO 256745[18]
Database references
SIMBADdata

DR Chamaeleontis (DR Cha), also known as HD 93237, is a star located in the southern circumpolar constellation Chamaeleon. The system has an average apparent magnitude of 5.97,[3] allowing it to be faintly visible to the naked eye. DR Cha is located relatively far at a distance of 1,060 light years based on Gaia DR3 parallax measurements,[2] but is receding with a poorly constrained heliocentric radial velocity of 18 km/s.[9]

The visible component has been given several spectral classes over the years. It has been given a luminosity class of a giant star (III),[6] a subgiant (IV),[5] a dwarf star (V),[19] and emission lines. Most sources generally agree that DR Cha is a B5 star. It has 6 times the mass of the Sun[11] and 6.48 times its girth.[12] It shines with a bolometric luminosity 1,587 times that of the Sun[13] from its photosphere at an effective temperature of 12,039 K,[15] giving it a blue hue. The object is estimated to be 50 million years old[11] and spins modestly with a projected rotational velocity of 70 km/s.[16]

In 1982, M. Jaschek listed DR Cha in a catalog of Be stars.[20] It has been classified as an Algol-type eclipsing binary, having a period of 19.4436 days.[4] However in 2022, Labadie-Bartz et al. examined the TESS data for this star, and found that the primary and secondary eclipses are separated by "about 20 days", which suggests that the 19.4436 day period published earlier may represent the time interval between primary and secondary eclipse, rather than the full orbital period.[21]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Watson2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  11. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  16. ^ a b Cite error: The named reference Yudin2001 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Morris1961 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Jaschek1982 was invoked but never defined (see the help page).
  21. ^ Cite error: The named reference Labadie-Bartz was invoked but never defined (see the help page).