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Star in the constellation Taurus From Wikipedia, the free encyclopedia
HL Tau 76 is a variable white dwarf star of the DAV (or ZZ Ceti) type. It was observed by G. Haro and W. J. Luyten in 1961,[8][9] and was the first variable white dwarf discovered when, in 1968, Arlo U. Landolt found that it varied in brightness with a period of approximately 749.5 seconds, or 12.5 minutes.[9] Like other DAV white dwarfs, its variability arises from non-radial gravity wave pulsations within itself.[10], § 7. Later observation and analysis has found HL Tau 76 to pulsate in over 40 independent vibrational modes, with periods between 380 seconds and 1390 seconds.[11]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Taurus |
Right ascension | 04h 18m 56.638s[2] |
Declination | +27° 17′ 48.31″[2] |
Apparent magnitude (V) | 14.1–15.28[3] |
Characteristics | |
Spectral type | DA4.3[4] |
B−V color index | 0.2[5] |
Variable type | DAV (ZZ Ceti)[3] |
Astrometry | |
Proper motion (μ) | RA: 62.600[2] mas/yr Dec.: −72.819[2] mas/yr |
Parallax (π) | 20.7244 ± 0.0338 mas[2] |
Distance | 157.4 ± 0.3 ly (48.25 ± 0.08 pc) |
Absolute magnitude (MV) | 11.69[4] |
Details | |
Mass | 0.575±0.005[6] M☉ |
Radius | 0.0162[6] R☉ |
Luminosity | 0.00389[6] L☉ |
Surface gravity (log g) | 7.8[7] cgs |
Temperature | 11,375±30[6] K |
Other designations | |
Database references | |
SIMBAD | data |
The designation HL Tau 76 derives from the discovery of this star as a white dwarf, when it was described as Taurus no.76 in a publication authored by Guillermo Haro and Willem Jacob Luyten.[8] The exact designation HL Tau 76 was then used in subsequent papers, including one giving the star its designation EGGR 265 where it was noted to be variable.[12] It was then included in the 57th name-list of variable stars and given the variable star designation V441 Tauri.[13] The unusual designation HL Tau 76 continues to be used by most authors.[14]
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