HD 49976

HD 49976

A light curve for V592 Monocerotis, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Monoceros
Right ascension 06h 50m 42.30314s[2]
Declination –08° 02′ 27.5937″[2]
Apparent magnitude (V) 6.16 to 6.32[3]
Characteristics
Spectral type A2p Sr Cr Eu[4] or B9V[5]
U−B color index +0.02[6]
B−V color index +0.00[6]
Variable type α2 CVn[3]
Astrometry
Radial velocity (Rv)+19.2±2.4[7] km/s
Proper motion (μ) RA: –9.794[2] mas/yr
Dec.: +2.720[2] mas/yr
Parallax (π)9.6666 ± 0.0529 mas[2]
Distance337 ± 2 ly
(103.4 ± 0.6 pc)
Absolute magnitude (MV)+1.13[8]
Details[8]
Mass2.21±0.11 M☉
Radius2.3±0.3 R☉
Luminosity32 L☉
Surface gravity (log g)4.04±0.13 cgs
Temperature9,016 K
Rotation2.976 days
Rotational velocity (v sin i)31[9] km/s
Age209[10] Myr
Other designations
V592 Monocerotis, BD−07°1592, HD 49976, HIP 32838, HR 2534, SAO 133761[11]
Database references
SIMBADdata

HD 49976 is a variable star in the constellation of Monoceros (the Unicorn). It has the variable star designation V592 Monocerotis, while HD 49976 is the identifier from the Henry Draper Catalogue.[11] It has a white hue and is near the lower limit of visibility to the naked eye, having an apparent visual magnitude that fluctuates from 6.16 down to 6.32 with a 2.976 day period.[3] Based upon parallax measurements, it is located at a distance of approximately 337 light years from the Sun.[2] The star is drifting further away with a radial velocity of +19 km/s.[7]

This is a magnetic chemically peculiar star with a stellar classification of A2p Sr Cr Eu,[4] showing excesses in strontium and the rare earth elements in the photosphere, among others. Houk and Swift (1999) assigned it a class of B9V, matching a B-type main sequence star.[5] It is an Alpha2 Canum Venaticorum variable;[3] the magnetic field is complex; not corresponding to a simple dipole.[12]

HD 49976 is an estimated 209[10] million years old and is spinning with a period of 2.976 days.[8] The star has 2.2 times the mass of the Sun and 2.3 times the Sun's radius. It is radiating 32 times the luminosity of the Sun from its photosphere at an effective temperature of 9,016 K.[8]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference aaa334_181 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aa393_897 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference ab68_4_454 was invoked but never defined (see the help page).