HD 28527
A-type star in the constellation Taurus
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HD 28527 is a star in the constellation Taurus, and a member of the Hyades open cluster.[9] It is faintly visible to the naked eye with an apparent visual magnitude of 4.78.[1] The distance to this star, as determined from its parallax shift of 22 mas, is 147 light years. It is moving away from the Earth with a heliocentric radial velocity of +38 km/s.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus[1] |
| Right ascension | 04h 30m 33.633s[2] |
| Declination | +16° 11′ 38.45″[2] |
| Apparent magnitude (V) | 4.78[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3][2] |
| Spectral type | A6 IV[4] or A7 V[5] |
| B−V color index | +0.170±0.001[1] |
| Variable type | suspected δ Sct[6] |
| Astrometry | |
| Radial velocity (Rv) | +38.1±0.8[1] km/s |
| Proper motion (μ) | RA: +104.889[2] mas/yr Dec.: −25.446[2] mas/yr |
| Parallax (π) | 22.1875±0.1430 mas[2] |
| Distance | 147.0 ± 0.9 ly (45.1 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.58[7] |
| Details | |
| Mass | 1.75[8] M☉ |
| Radius | 2.209[9] R☉ |
| Luminosity | 19.03[1] L☉ |
| Surface gravity (log g) | 4.17±0.14[8] cgs |
| Temperature | 8,274±281[8] K |
| Metallicity [Fe/H] | +0.30[10] dex |
| Rotation | 1.278 d[9] |
| Rotational velocity (v sin i) | 87.5[9] km/s |
| Age | 307[8] Myr |
| Other designations | |
| NSV 1627, BD+15°637, GJ 170.1, GJ 9157, HD 28527, HIP 21029, HR 1427, SAO 93975[11] | |
| Database references | |
| SIMBAD | data |
Based upon a stellar classification of A6 IV by Cowley et al. (1969),[4] this is an A-type subgiant star that has consumed the hydrogen at its core and is evolving away from the main sequence. Older studies had it classed as an A-type main-sequence star with a class of A7 V.[5] At the age of 307[8] million years, it has a high rate of spin, revolving upon its axis once every 1.278 days.[9] It is a Delta Scuti variable[6] with 1.75[8] times the mass of the Sun and 2.2[9] times the Sun's radius. The star is radiating 19[1] times the Sun's luminosity from its photosphere at an effective temperature of 8,274 K.[8]
Due to its location near the ecliptic, this star is subject to lunar occultations. These events have provided occasional, but not definitive, evidence of a close secondary companion.[12][13] Eggleton and Tokovinin (2008) catalogue this as a possible triple star system, having the inner pair being similar stars with an angular separation of 0.02″, and the outer component a magnitude 6.7 star of class F2 at a much wider separation of 250″.[14] The wide companion is HD 28458, another member of the Hyades.[11]
