38 Arietis
File:38AriLightCurve.png Four visual band light curves for 38 Arietis, adapted from Valtier et al. (1974)[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries[2] |
| Right ascension | 02h 44m 57.57945s[3] |
| Declination | +12° 26′ 44.7297″[3] |
| Apparent magnitude (V) | +5.178[4] |
| Characteristics | |
| Spectral type | A7 III-IV[5] |
| U−B color index | +0.121[4] |
| B−V color index | +0.235[4] |
| Variable type | δ Sct[6] |
| Astrometry | |
| Radial velocity (Rv) | -1.5[7] km/s |
| Proper motion (μ) | RA: +120.49[3] mas/yr Dec.: -85.78[3] mas/yr |
| Parallax (π) | 27.52±0.40 mas[3] |
| Distance | 119 ± 2 ly (36.3 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.22[8] |
| Details | |
| Radius | 2.1[9] R☉ |
| Luminosity | 11[8] L☉ |
| Surface gravity (log g) | 4.04[8] cgs |
| Temperature | 7,638[8] K |
| Rotational velocity (v sin i) | 86[10] km/s |
| Age | 0.58[11] Gyr |
| Other designations | |
| UV Arietis, BD+11°377, HD 17093, HIP 12832, HR 812, SAO 93083[12] | |
| Database references | |
| SIMBAD | data |
38 Arietis (abbreviated 38 Ari) is a variable star in the northern constellation of Aries. 38 Arietis is the Flamsteed designation. It was once designated 88 Ceti,[13] forming part of the neighboring constellation of Cetus. With an apparent visual magnitude of +5.18,[4] it is bright enough to be viewed with the naked eye. The measured annual parallax shift of 27.52 mas[3] is equivalent to a distance of approximately 119 light-years (36 parsecs) from Earth.
Rober L. Millis discovered that 38 Arietis is a variable star, at Lowell Observatory, in October 1966. The discovery was announced in 1967.[14] It was given its variable star designation, UV Arietis, in 1970.[15]
The spectrum of this star matches a stellar classification of A7 III-IV,[5] with the luminosity class of III-IV indicating it shows traits part way between the subgiant and giant star stages of its evolution. It is a Delta Scuti variable with a period of 0.0355 days (51 minutes) and a magnitude change of 0.040.[6] This star is larger than the Sun, with more than double the Sun's radius and 11 times the luminosity.[8] This energy is being radiated into outer space from the atmosphere at an effective temperature of 7,638 K,[8] giving it the white-hued glow of an A-type star.
References
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- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Constellation record for this object at VizieR.
- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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