DR Chamaeleontis

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DR Chamaeleontis
DRChaLightCurve.png
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]
Distance 1,060 ± 20  ly
(325 ± 5  pc)
Absolute magnitude  (MV)−1.28 [10]
Details
Mass 6±0.1 [11]   M☉
Radius 6.48 [12]   R☉
Luminosity (bolometric)1,587 [13]   L☉
Surface gravity (log g)3.44 [14]   cgs
Temperature 12,039±190 [15]   K
Metallicity [Fe/H]+0.08 [14]   dex
Rotational velocity (v sin i)70±7 [16]  km/s
Age 50±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
SIMBAD data

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]

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References

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