 Four visual band light curves for 38 Arietis, adapted from Valtier et al. (1974) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02 44 57.57945 |
| Declination | +12° 26′ 44.7297″ |
| Apparent magnitude (V) | +5.178 |
| Characteristics | |
| Spectral type | A7 III-IV |
| U−B color index | +0.121 |
| B−V color index | +0.235 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | -1.5 km/s |
| Proper motion (μ) | RA: +120.49 mas/yr Dec.: -85.78 mas/yr |
| Parallax (π) | 27.52 ± 0.40 mas |
| Distance | 119 ± 2 ly (36.3 ± 0.5 pc) |
| Absolute magnitude (MV) | 2.22 |
| Details | |
| Radius | 2.1 R☉ |
| Luminosity | 11 L☉ |
| Surface gravity (log g) | 4.04 cgs |
| Temperature | 7,638 K |
| Rotational velocity (v sin i) | 86 km/s |
| Age | 0.58 Gyr |
| Other designations | |
| UV Arietis, BD+11° 377, HD 17093, HIP 12832, HR 812, SAO 93083. | |
| 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, forming part of the neighboring constellation of Cetus. With an apparent visual magnitude of +5.18, it is bright enough to be viewed with the naked eye. The measured annual parallax shift of 27.52 mas 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. It was given its variable star designation, UV Arietis, in 1970.
The spectrum of this star matches a stellar classification of A7 III-IV, 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. This star is larger than the Sun, with more than double the Sun's radius and 11 times the luminosity. This energy is being radiated into outer space from the atmosphere at an effective temperature of 7,638 K, giving it the white-hued glow of an A-type star.
References
- 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. Retrieved 28 October 2021.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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. Retrieved 28 November 2024.
- Kukarkin, B. V.; Kholopov, P. N.; Perova, N. B/ (October 1970). "57th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 480. Bibcode:1970IBVS..480....1K. Retrieved 28 November 2024.
External links
| Constellation of Aries | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stars |
| ||||||||||||
| |||||||||||||
| Galaxies |
| ||||||||||||
| |||||||||||||
| |||||||||||||
 Category | |||||||||||||