38 Arietis
| 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
[edit]- ^ Valtier, J. C.; Sareyan, J. P.; Le Contel, J. M.; Zribi, G. (January 1974). "Photometric observations of delta Scuti stars. II. HR 432, HR 515, HR 812". Astronomy & Astrophysics Supplement Series. 18: 235–249. Bibcode:1974A&AS...18..235V.
- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966). "A System of photometric standards". Publications of the Department of Astronomy University of Chile. 1. Publicaciones Universidad de Chile, Department de Astronomy: 1–17. Bibcode:1966PDAUC...1....1G.
- ^ a b Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
- ^ a b Rodríguez, E.; López-González, M. J.; López de Coca, P. (June 2000). "A revised catalogue of delta Sct stars". Astronomy and Astrophysics Supplement Series. 144 (3): 469–474. Bibcode:2000A&AS..144..469R. doi:10.1051/aas:2000221. hdl:10261/226673.
- ^ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institute of Washington D.C. Bibcode:1953GCRV..C......0W.
- ^ a b c d e f Paunzen, E.; et al. (September 2002). "On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of lambda Bootis type stars". Astronomy and Astrophysics. 392 (2): 515–528. arXiv:astro-ph/0207494. Bibcode:2002A&A...392..515P. doi:10.1051/0004-6361:20020854. S2CID 54666586.
- ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics. 367 (2): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
- ^ Royer, F.; et al. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics. 393: 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763.
- ^ Vican, Laura (June 2012). "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey". The Astronomical Journal. 143 (6): 135. arXiv:1203.1966. Bibcode:2012AJ....143..135V. doi:10.1088/0004-6256/143/6/135. S2CID 118539505.
- ^ "38 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
- ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 215. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
- ^ Millis, Robert L. (June 1967). "Photoelectric Observations of Two New Short-Period Variables". Publications of the Astronomical Society of the Pacific. 79 (468): 262–265. Bibcode:1967PASP...79..262M. doi:10.1086/128479.
- ^ Kukarkin, B. V.; Kholopov, P. N.; Perova, N. B/ (October 1970). "57th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 480: 1. Bibcode:1970IBVS..480....1K. Retrieved 28 November 2024.
