HR 1170
Location of HR 1170 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 49m 08.10977s[1]
Declination +43° 57′ 47.3016″[1]
Apparent magnitude (V) 5.77 - 5.91[2]
Characteristics
Spectral type A9IV[3]
U−B color index 0.06[4]
B−V color index 0.26[4]
Variable type Delta Scuti[2]
Astrometry
Radial velocity (Rv)−11.1±2.6[5] km/s
Proper motion (μ) RA: −3.453±0.244[1] mas/yr
Dec.: 11.469±0.200[1] mas/yr
Parallax (π)14.6959 ± 0.2134 mas[1]
Distance222 ± 3 ly
(68.0 ± 1.0 pc)
Absolute magnitude (MV)1.73±0.07[6]
Details
Mass1.98±0.04[7] M☉
Radius2.7[1] R☉
Luminosity23±2[7] L☉
Surface gravity (log g)3.77[1] cgs
Temperature7194±50[8] K
Metallicity [Fe/H]0.30[3] dex
Rotational velocity (v sin i)103[7] km/s
Age1.12[1] Gyr
Other designations
V376 Per, HD 23728, HIP 17846, SAO 39128[9]
Database references
SIMBADdata

HR 1170, also known as HD 23728 and V376 Persei, is a star about 220 light years from the Earth, in the constellation Perseus.[1] It is a 5th magnitude star, so it will be faintly visible to the naked eye of an observer far from city lights. It is a variable star, whose brightness varies slightly from magnitude 5.77 to 5.91.[2]

A light curve for V376 Persei, plotted from TESS data[10]

Michel Breger announced that HR 1170 is a Delta Scuti variable star in 1969, based on observations taken over 6 hours and 10 minutes on October 13, 1967. He reported that it varied with a mean amplitude of 0.08 magnitudes, over a period of 2.2 hours.[11] In 1970 it was given the variable star designation V376 Persei.[12]

Early investigations of HR 1170 showed that it has more than one pulsation period,[13] as is true for most Delta Scuti stars,[14] and the light curve shows the different periods beating with each other. Many investigators have tried to determine the modes of oscillation present in this star.[15][16][17][18][19][20][21] All but one[19] of these studies find only two significant periods. All agree that one of the periods is approximately 2.386 hours, but the studies do not agree on the second period.[21] There is also no agreement as to whether the pulsations are radial, nonradial or a combination of the two, though most of the later studies, which examine data taken over a longer time window, conclude that at least one of the pulsation modes is nonradial.

References

  1. 1 2 3 4 5 6 7 8 9 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 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. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  3. 1 2 Netopil, Martin (August 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. Retrieved 12 March 2023.
  4. 1 2 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415–419. Bibcode:1991A&AS...89..415O. Retrieved 14 March 2023.
  5. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. Retrieved 12 March 2023.
  6. ↑ Barac, Natascha; Bedding, Timothy R.; Murphy, Simon J.; Hey, Daniel R. (October 2022). "Revisiting bright δ Scuti stars and their period-luminosity relation with TESS and Gaia DR3". Monthly Notices of the Royal Astronomical Society. 516 (2): 2080–2094. arXiv:2207.00343. Bibcode:2022MNRAS.516.2080B. doi:10.1093/mnras/stac2132. Retrieved 12 March 2023.
  7. 1 2 3 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Retrieved 12 March 2023.
  8. ↑ Soubiran, C.; Le Campion, J. F.; Cayrel de Strobel, G.; Caillo, A. (June 2010). "The PASTEL catalogue of stellar parameters". Astronomy and Astrophysics. 515: A111. arXiv:1004.1069. Bibcode:2010A&A...515A.111S. doi:10.1051/0004-6361/201014247. Retrieved 12 March 2023.
  9. ↑ "HD 151804 -- Blue Supergiant". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-03-03.
  10. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 11 March 2023.
  11. ↑ Breger, M. (March 1969). "Short-period variability of B, A, and F stars. II. Photometry of new Delta Scuti stars". Astronomical Journal. 74: 166–176. Bibcode:1969AJ.....74..166B. doi:10.1086/110788. Retrieved 12 March 2023.
  12. ↑ Kukarkin, B. V.; Kholopov, P. N.; Perova, N. B. (October 1970). "57th Name-List of Variable Stars". Information Bulletin on Variable Stars. 480. Bibcode:1970IBVS..480....1K. Retrieved 12 March 2023.
  13. ↑ Warman, J.; Malacara, Z.; Breger, M. (November 1974). "The light curves of Delta Scuti stars HR 1170 and HR 7563". Revista Mexicana de Astronomía y Astrofísica. 1: 143–150. Bibcode:1974RMxAA...1..143W. Retrieved 14 March 2023.
  14. ↑ Jayasinghe, T.; Stanek, K. Z.; Kochanek, C. S.; Vallely, P. J.; Shappee, B. J.; Holoien, T. W. S.; Thompson, Todd A.; Prieto, J. L.; Pejcha, O.; Fausnaugh, M.; Otero, S.; Hurst, N.; Will, D. (April 2020). "The ASAS-SN catalogue of variable stars VI: an all-sky sample of δ Scuti stars". Monthly Notices of the Royal Astronomical Society. 493 (3): 4186–4208. arXiv:1910.14187. Bibcode:2020MNRAS.493.4186J. doi:10.1093/mnras/staa499. Retrieved 14 March 2023.
  15. ↑ Breger, M.; Bregman, J. N. (September 1975). "Period-luminosity-color relations and pulsation modes of pulsating variable stars". Astrophysical Journal. 200: 343–353. Bibcode:1975ApJ...200..343B. doi:10.1086/153794. Retrieved 14 March 2023.
  16. ↑ Gupta, S. K. (May 1977). "Study of the Delta Scuti Star HR 1170". Astrophysics and Space Science. 48 (1): 199–206. Bibcode:1977Ap&SS..48..199G. doi:10.1007/BF00643051. Retrieved 14 March 2023.
  17. ↑ Pena, J. H.; Warman, J. (July 1979). "HR 1170 and HR 7331, two nonradial Delta Scuti pulsators". Astronomical Journal. 84: 1046–1055. Bibcode:1979AJ.....84.1046P. doi:10.1086/112511. Retrieved 14 March 2023.
  18. ↑ Pena, J. H.; Warman, J. (April 1980). "On the periods of the del SCT star HR 1170". Revista Mexicana de Astronomía y Astrofísica. 5: 5–7. Bibcode:1980RMxAA...5....5P. Retrieved 14 March 2023.
  19. 1 2 Warman, J.; Pena, J. H.; Margrave, T. E. (October 1980). "Nonradial period structure of the del SCT star HR 1170". Publications of the Astronomical Society of the Pacific. 92: 696–699. Bibcode:1980PASP...92..696W. doi:10.1086/130732. Retrieved 14 March 2023.
  20. ↑ Kurtz, D. W. (March 1981). "Radial and non-radial oscillations in the Del SCT star HR 1170". Monthly Notices of the Royal Astronomical Society. 194: 747–754. Bibcode:1981MNRAS.194..747K. doi:10.1093/mnras/194.3.747. Retrieved 14 March 2023.
  21. 1 2 Ostermann, W. M. (February 1990). "Pulsation periods in theδ Scuti star HR 1170". Astrophysics and Space Science. 164 (1): 87–93. Bibcode:1990Ap&SS.164...87O. doi:10.1007/BF00653553. Retrieved 14 March 2023.
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