Astronomy:38 Arietis

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Short description: Star in the constellation Aries
38 Arietis
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Four visual band light curves for 38 Arietis, adapted from Valtier et al. (1974)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aries[2]
Right ascension  02h 44m 57.57945s[3]
Declination +12° 26′ 44.7297″[3]
Apparent magnitude (V) +5.18 - 5.22[4]
Characteristics
Spectral type A7 III-IV[5]
U−B color index +0.121[6]
B−V color index +0.235[6]
Variable type δ Sct[7]
Astrometry
Radial velocity (Rv)-1.5[8] km/s
Proper motion (μ) RA: +120.49[3] mas/yr
Dec.: -85.78[3] mas/yr
Parallax (π)27.52 ± 0.40[3] mas
Distance119 ± 2 ly
(36.3 ± 0.5 pc)
Absolute magnitude (MV)2.22[9]
Details
Radius2.1[10] R☉
Luminosity11[9] L☉
Surface gravity (log g)4.04[9] cgs
Temperature7,638[9] K
Rotational velocity (v sin i)86[11] km/s
Age0.58[12] Gyr
Other designations
UV Arietis, BD+11°377, HD 17093, HIP 12832, HR 812, SAO 93083[13]
Database references
SIMBADdata

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,[14] forming part of the neighboring constellation of Cetus. With an apparent visual magnitude of about +5.2 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.[15] It was given its variable star designation, UV Arietis, in 1970.[16]

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.[7] This star is larger than the Sun, with more than double the Sun's radius and 11 times the luminosity.[9] This energy is being radiated into outer space from the atmosphere at an effective temperature of 7,638 K,[9] giving it the white-hued glow of an A-type star.

References

  1. ↑ 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. 
  2. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  4. ↑ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  5. ↑ 5.0 5.1 Cowley, A. et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C. 
  6. ↑ 6.0 6.1 Gutierrez-Moreno, Adelina et al. (1966). "A System of photometric standards". Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy) 1: 1–17. Bibcode: 1966PDAUC...1....1G. 
  7. ↑ 7.0 7.1 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. doi:10.1051/aas:2000221. Bibcode: 2000A&AS..144..469R. 
  8. ↑ 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. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 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. doi:10.1051/0004-6361:20020854. Bibcode: 2002A&A...392..515P. 
  10. ↑ 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. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P. 
  11. ↑ 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. doi:10.1051/0004-6361:20020943. Bibcode: 2002A&A...393..897R. 
  12. ↑ Vican, Laura (June 2012). "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey". The Astronomical Journal 143 (6): 135. doi:10.1088/0004-6256/143/6/135. Bibcode: 2012AJ....143..135V. 
  13. ↑ "38 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=38+Ari. 
  14. ↑ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy 18 (3): 215. doi:10.1177/002182868701800305. Bibcode: 1987JHA....18..209W. 
  15. ↑ 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. doi:10.1086/128479. Bibcode: 1967PASP...79..262M. 
  16. ↑ Kukarkin, B. V.; Kholopov, P. N.; Perova, N. B/ (October 1970). "57th Name-List of Variable Stars". Information Bulletin on Variable Stars 480: 1. Bibcode: 1970IBVS..480....1K. https://ibvs.konkoly.hu/pub/ibvs/0401/0480.pdf. Retrieved 28 November 2024. 



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