Ross 248

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Ross 248
Data pengamatan
Epos J2000
Rasi bintang Andromeda
Asensio rekta  23j 41m 54.99d[1]
Deklinasi  +44° 10′ 40.8″[1]
Magnitudo tampak (V) 12.29[2]
Ciri-ciri
Kelas spektrum M6e[3]
Indeks warna U-B +1.48[2]
Indeks warna B-V +1.92[2]
Jenis variabel Flare star
Astrometri
Kecepatan radial (Rv) -81[4] km/s
Gerak diri (μ) RA: 111[5] mas/thn
Dek.: -1584[5] mas/thn
Paralaks (π) 316.80 ± 1.10[6] mas
Jarak Kesalahan ekspresi: Karakter tanda baca "[" tak dikenali ± Kesalahan ekspresi: Karakter tanda baca "[" tak dikenali tc
(Kesalahan ekspresi: Karakter tanda baca "[" tak dikenali ± Kesalahan ekspresi: Karakter tanda baca "[" tak dikenali pc)
Magnitudo mutlak (MV) 14.79[7]
Detail
Massa 0.12[8] M
Radius 0.16[9] R
Gravitasi permukaan (log g) 5.12[3]
Luminositas 0.0018[10] L
Suhu 2,799[3] K
Rotasi v sin i < 3 km/s[11]
Penamaan lain
HH Andromedae, HH And, GCTP 5736.00, GJ 905, Gl 171-010, LHS 549, 2MASS J23415498+4410407.[2]

Ross 248 (HH Andromedae) adalah bintang katai merah yang terletak sejauh 10,3 tahun cahaya dari Bumi. Bintang ini berada di rasi bintang Andromeda.

Bintang ini memunyai 12% massa matahari, 16% jari-jari matahari, dan 0,2% luminositas matahari. Ross 248 merupakan bintang suar yang kadang-kadang luminositasnya meningkat.[12]

Referensi[sunting | sunting sumber]

  1. ^ a b Cutri, R. M. et al (June 2003). 2MASS All Sky Catalog of point sources. NASA/IPAC. Bibcode:2003tmc..book.....C. 
  2. ^ a b c d "V* HH And – Flare Star". SIMBADa. Centre de Données astronomiques de Strasbourg. Diakses 2009-09-06. 
  3. ^ a b c Cenarro, A. J.; Peletier, R. F.; Sánchez–blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón–barroso, J.; Gorgas, J. et al. (2007). "Medium-resolution Isaac Newton Telescope Library of Empirical Spectra – II. The Stellar Atmospheric Parameters". Monthly Notices of the Royal Astronomical Society 374 (2): 664–690. doi:10.1111/j.1365-2966.2006.11196.x. 
  4. ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495..... 
  5. ^ a b Lépine, Sébastien; Shara, Michael M (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal 129 (3): 1483–1522. doi:10.1086/427854. 
  6. ^ Leggett, S. K. (September 1992). "Infrared colors of low-mass stars". Astrophysical Journal Supplement Series 82 (1): 351–394. doi:10.1086/191720. 
  7. ^ Schroeder, Daniel J.; Golimowski, David A.; Brukardt, Ryan A.; Burrows, Christopher J.; Caldwell, John J.; Fastie, William G.; Ford, Holland C.; Hesman, Brigette et al. (2000). "A Search for Faint Companions to Nearby Stars Using the Wide Field Planetary Camera 2". The Astronomical Journal 119: 906–922. doi:10.1086/301227. 
  8. ^ "The One Hundred Nearest Star Systems". Research Consortium on Nearby Stars. 2009-01-01. Diakses 2009-09-06. 
  9. ^ Johnson, H. M.; Wright, C. D. (November 1983). "Predicted infrared brightness of stars within 25 parsecs of the Sun". Astrophysical Journal Supplement Series 53: 643–711. doi:10.1086/190905.  See p. 705.
  10. ^ West, Frederick R. (June 1999). "Monitoring Nearby Stars for Transits by Extrasolar Jovial Planets, II: Transits of M-Type (Red) Dwarf Stars by Close Extrasolar Giant (Jovian) Planets". The Journal of the American Association of Variable Star Observers 27 (1): 77–78. Bibcode:1999JAVSO..27...77W. 
  11. ^ Reiners, A.; Basri, G. (February 2007). "The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars". The Astrophysical Journal 656 (2): 1121–1135. doi:10.1086/510304. 
  12. ^ Poveda, Arcadio; Allen, Christine; Herrera, Miguel Angel (1996). "Chromospheric Activity, Stellar Winds and Red Stragglers". Workshop on Colliding Winds in Binary Stars to Honor Jorge Sahade 5: 16–20, Universidad Nacional Autonoma de Mexico. 

Pranala luar[sunting | sunting sumber]