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HR 1170

Location of HR 1170 (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Perseus
Right ascension	03 49 08.10977
Declination	+43° 57′ 47.3016″
Apparent magnitude (V)	5.77 - 5.91
Characteristics
Spectral type	A9IV
U−B color index	0.06
B−V color index	0.26
Variable type	Delta Scuti
Astrometry
Radial velocity (Rv)	−11.1±2.6 km/s
Proper motion (μ)	RA: −3.453±0.244 mas/yr Dec.: 11.469±0.200 mas/yr
Parallax (π)	14.6959 ± 0.2134 mas
Distance	222 ± 3 ly (68.0 ± 1.0 pc)
Absolute magnitude (MV)	1.73±0.07
Details
Mass	1.98±0.04 M☉
Radius	2.7 R☉
Luminosity	23±2 L☉
Surface gravity (log g)	3.77 cgs
Temperature	7194±50 K
Metallicity	0.30 dex
Rotational velocity (v sin i)	103 km/s
Age	1.12 Gyr
Other designations
V376 Per, HD 23728, HIP 17846, SAO 39128
Database references
SIMBAD	data

HR 1170, also known as HD 23728 and V376 Persei, is a star about 220 light years from the Earth, in the constellation Perseus. 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.

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. In 1970 it was given the variable star designation V376 Persei.

Early investigations of HR 1170 showed that it has more than one pulsation period, as is true for most Delta Scuti stars, 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. All but one 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. 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. ^ 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. ^ 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. ^ 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. ^ 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. ^ 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.
12. 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. 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.
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. ^ 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.
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. ^ 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.

v t e Constellation of Perseus
List of stars in Perseus Perseus in Chinese astronomy
Stars	Bayer α (Mirfak) β (Algol) γ δ ε ζ η (Miram) θ ι κ (Misam) λ μ ν ξ (Menkib) ο (Atik) π (Gorgonea Secunda) ρ (Gorgonea Tertia) σ τ φ ψ ω (Gorgonea Quarta) b Flamsteed 1 2 3 4 (g) 5 7 8 9 (i) 10 11 12 14 16 17 20 21 24 29 30 31 32 (l) 34 36 40 (o) 42 (n) 43 (A) 48 (c) 49 50 52 (f) 53 (d) 54 55 56 57 (m) 58 (e) 59 1 Aur Variable S T U V X Z RS RT RV RW RY ST SU SV TZ UV UX UY VX XX XY XZ YZ AB AG AR AS AW AX BM DM DY FO GK IK IP IQ IU IW IX IZ KP KS KT KW LX V351 V356 V357 V361 V376 V380 V386 V392 V396 V400 V423 V432 V440 V459 V461 V471 V472 V473 V480 V490 V492 V505 V509 V518 V520 (61 And) V521 V545 V551 V572 V573 V575 V576 V621 V718 V1024 HR 470 526 529 538 540 621 641 787 792 810 820 831 842 846 849 864 865 876 885 886 890 894 918 (k) 920 923 930 949 950 956 964 966 969 973 975 979 986 991 1001 1019 1034 1037 1041 1047 1051 1056 1059 1074 1097 1113 1127 1130 1133 1141 1160 1164 1176 1191 1197 1198 1207 1215 1226 1234 1286 1301 1330 1333 1337 1344 1371 1390 1419 1424 1482 1489 1493 1500 1514 HD 13519 14433 14434 16691 16760 17092 17245 17605 21684 22781 23301 23596 25329 26702 29587 Other BD+31 643 BD+48 740 G 38-29 G 95-57 GD 61 HAT-P-15 (Berehynia) HAT-P-29 (Muspelheim) IRAS 04296+3429 L1448-IRS2E LkHα 101 LRLL 54361 NGC 1333 13 NGC 1333 IRAS 2A NGC 1333 IRAS 4A NGC 1333 IRAS 4B NGC 1624-2 PSR B0355+54 PSR J0357+3205 WR 4
Exoplanets WASP-11b/HAT-P-10b
Star clusters	NGC 869 (h) 884 (χ) 957 1039 1220 1285 1342 1444 1513 1528 1545 1624 Other Alpha Persei Cluster IC 348 Trumpler 2
Nebulae	NGC 650 (Little Dumbbell Nebula) 1333 1491 1499 (California Nebula) 1579 Other Barnard 203 Wreath Nebula
Galaxies	NGC 1003 1023 1058 1077 1086 1159 1160 1161 1167 1169 1175 (Peanut Galaxy) 1198 1250 1259 1260 1264 1265 1267 1268 1270 1271 1272 1273 1274 1275 1277 1278 1279 1281 1282 1283 1293 1294 1334 Other 1H 0323+342 IC 310 UGC 2885 (Godzilla galaxy) 4C +37.11
Galaxy clusters Perseus Cluster
Astronomical events SN 2006gy Perseids
Category

• Perseus (constellation)
• Hipparcos objects
• Henry Draper Catalogue objects
• Objects with variable star designations
• Delta Scuti variables
• A-type subgiants
• Bright Star Catalogue objects