Binary star; Cassiopeia
Location of HD 4222 on the map (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation Cassiopeia
A
Right ascension 00h 45m 17.17365s [1]
Declination +55° 13′ 17.0310″[1]
Apparent magnitude (V)5.41± 0.01[2]
B
Right ascension 00h 45m 17.14092s [3]
Declination +55° 13′ 15.4000″[3]
Apparent magnitude (V)11.5[4]
Characteristics
A
Evolutionary stage
main sequence star [5]
Spectral type
A2 Vs[6] [7]
U−B color index
+0.05[8]
B−V color index
+0.04[8]
B
Spectral type
M2-5V[9]
Astrometry Radial velocity (Rv )−8.5± 2[10] Proper motion (μ) RA: −29.935 mas /yr [1] Dec.: −5.616 mas /yr [1] Parallax (π)9.2342 ± 0.0586 mas [1] Distance 353 ± 2 ly pc ) Absolute magnitude (MV )+0.44[11] Details A Mass 2.59± 0.04[5] M ☉ Radius 3.47± 0.18[12] R ☉ Luminosity 69.1+5.6 −5.2 [5] L ☉ Surface gravity (log g )3.72+0.08 −0.06 [13] cgs Temperature 9,886[14] K Metallicity −0.26[15] dex Rotational velocity (v sin i )25± 8[7] Age 407+51 −52 [1] Myr Other designations AG +54°69,
BD +54°143,
GC 894,
HD 4222,
HIP 3544,
HR 196,
SAO 21677,
ADS 625 A,
CCDM J00453+5514A,
WDS J00453+5513A,
TIC 445136120[16] Database references SIMBAD data
HD 4222 , also known as HR 196 , is the primary of a binary star [17] constellation Cassiopeia . It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.41.[2] Gaia DR3 parallax measurements imply a distance of 353 light-years and it is drifting closer with a heliocentric radial velocity of km/s [10] interstellar extinction of 0.13 magnitudes and it has an absolute magnitude of +0.44.[11]
HD 4222 has a stellar classification of A2 Vs or A1 V,[6] [7] A-type main-sequence star that is generating energy via hydrogen fusion at its core . The former class includes the presence of 'sharp' or narrow absorption lines due to slow rotation. Consistent with the class, HD 4222 spins modestly with a projected rotational velocity of approximately km/s [7] mass of the Sun [5] radius of the Sun .[12] luminosity of the Sun [5] photosphere with an effective temperature of K [14] iron abundance of [Fe/H] = −0.26 or 55% of the Sun 's.[15] million years ,[1] main sequence lifetime.[5]
HD 4222 and BU 492B make up the binary system BU 492. The companion is a red dwarf with a stellar classification of M2-5V; it is located 1.5" away from the primary along a position angle of 173°. BU 492B was first noticed by astronomer S. W. Burnham in 1878. HD 4222 also has one optical companion; an 11th magnitude star located 88.6" away, which itself is also a double star .[4] X-ray emission with a luminosity of × 1020 W [9] A-type stars are not expected to emit X-rays, so it might be coming from the companion. HD 4222 is considered to be a probable member of the Sirius supercluster , a group of stars moving with the bright star Sirius and share a common origin with the system.[18]
References
^ a b c d e f 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 .^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27–L30. Bibcode :2000A&A...355L..27H . ISSN 0004-6361 . S2CID 17128864 . ^ a b 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 .^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466–3471. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 ISSN 0004-6256 . S2CID 119533755 . ^ a b c d e f Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities" . Astronomy & Astrophysics . 537 : A120. arXiv :1201.2052 Bibcode :2012A&A...537A.120Z . doi :10.1051/0004-6361/201117691 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 55586789 . ^ a b Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications" . The Astronomical Journal . 74 : 375. Bibcode :1969AJ.....74..375C . doi :10.1086/110819 ISSN 0004-6256 . S2CID 121555804 . ^ a b c d Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars" . The Astrophysical Journal Supplement Series . 99 : 135. Bibcode :1995ApJS...99..135A . doi :10.1086/192182 ISSN 0067-0049 . S2CID 120495962 . ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD , Bibcode :1986EgUBV........0M ^ a b Schröder, C.; Schmitt, J. H. M. M. (24 September 2007). "X-ray emission from A-type stars" . Astronomy & Astrophysics . 475 (2): 677–684. Bibcode :2007A&A...475..677S . doi :10.1051/0004-6361:20077429 eISSN 1432-0746 . ISSN 0004-6361 . ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication : 0. Bibcode :1953GCRV..C......0W . S2CID 120000732 . ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119257644 . ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry" . Astronomy & Astrophysics . 426 (1): 297–307. arXiv :astro-ph/0404180 Bibcode :2004A&A...426..297K . doi :10.1051/0004-6361:20035930 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 6077801 . ^ Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138. arXiv :1905.10694 Bibcode :2019AJ....158..138S . doi :10.3847/1538-3881/ab3467 eISSN 1538-3881 . hdl :1721.1/124721 S2CID 166227927 . ^ a b Fracassini, M.; Manzolini, F.; Pasinetti, L. E.; Ruggenini, M. (May 1980). "Apparent radii and other parameters for 416 B5 V-F5 V stars of the catalogue of the Geneva observatory". Astrophysics and Space Science . Springer Science and Business Media LLC. 69 (2): 401–423. Bibcode :1980Ap&SS..69..401F . doi :10.1007/bf00661927 . ISSN 0004-640X . S2CID 189849072 . ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" . Astronomy & Astrophysics . 628 : A94. arXiv :1904.11302 Bibcode :2019A&A...628A..94A . doi :10.1051/0004-6361/201935765 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 131780028 . ^ "HD 4222" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved November 8, 2023 .^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems" . Monthly Notices of the Royal Astronomical Society . 389 (2): 869–879. arXiv :0806.2878 Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x eISSN 1365-2966 . ISSN 0035-8711 . S2CID 14878976 . ^ Eggen, O. J. (June 1, 1960). "Stellar Groups, VIII. The Structure of the Sirius Group" . Monthly Notices of the Royal Astronomical Society . Oxford University Press (OUP). 120 (6): 563–580. Bibcode :1960MNRAS.120..563E . doi :10.1093/mnras/120.6.563 ISSN 0035-8711 . S2CID 119805328 .
This page was last edited on 25 January 2024, at 22:25
This page was last edited on 25 January 2024, at 22:25