38 Arietis

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38 Arietis
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

  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. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  3. 1 2 3 4 5 6 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.
  4. 1 2 3 4 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.
  5. 1 2 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.
  6. 1 2 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 .
  7. ↑ 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.
  8. 1 2 3 4 5 6 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.
  9. ↑ 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.
  10. ↑ 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.
  11. ↑ 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.
  12. ↑ "38 Ari". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-18.
  13. ↑ 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.
  14. ↑ 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.
  15. ↑ 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.
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