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HD 4778

A light curve for GO Andromedae, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 00h 50m 18.26563s [2]
Declination +45° 00′ 08.1439″ [2]
Apparent magnitude (V) 6.13 [3]
Characteristics
Spectral type A3VpSiSrCrEuKsn [4]
B−V color index 0.043±0.004 [3]
Variable type α2 CVn [5]
Astrometry
Radial velocity (Rv)1.60 [6] km/s
Proper motion (μ) RA: 65.353 [2]  mas/ yr
Dec.: 4.133 [2]  mas/ yr
Parallax (π)9.3224 ± 0.0916  mas [2]
Distance350 ± 3  ly
(107 ± 1  pc)
Absolute magnitude (MV)1.18 [7]
Details
Mass2.24±0.09 [7]  M☉
Radius2.36±0.12 [8]  R☉
Luminosity34.9±4.3 [8]  L☉
Surface gravity (log g)4.12±0.09 [7]  cgs
Temperature9,135±400 [8]  K
Rotation2.5616 [7] days
Rotational velocity (v sin i)33 [4] km/s
Age77 [9]  Myr
Other designations
GO Andromedae, BD+44° 176, FK5 2055, HD 4778, HIP 3919, HR 234, SAO 36702, PPM 43369 [10]
Database references
SIMBAD data

HD 4778, also known as HR 234 and GO Andromedae, is a variable star in the constellation Andromeda. Its magnitude varies by 0.04 magnitudes from the median of 6.12 with a period of approximately 2.55 days. [11] The star is located 350  light years away, as determined from its annual parallax shift of 9.32  mas. [2]

This is an Ap star with a stellar classification of A3VpSiSrCrEuKsn, [4] showing chemical peculiarities in its spectrum from strontium, chromium, and europium. [12] It is an Alpha2 Canum Venaticorum variable [5] with a magnetic field that varies across the range +1,400 to −1,100  G. [13] This rotation-modulated variability allows direct determination of the rotation rate of 2.5616 days. [7]

HD 4778 has 2.24 [7] times the mass of the Sun and 2.36 [8] times the Sun's radius. The star is radiating 35 [8] times the Sun's luminosity from its photosphere at an effective temperature of 9,375 K. [7] It is about 77 [9] million years old.

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051.
  3. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID  119257644.
  4. ^ a b c Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182.
  5. ^ a b Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General Catalogue of Variable Stars". Astronomy Reports. GCVS 5.1. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. S2CID  125853869.
  6. ^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv: 0705.0878. Bibcode: 2007AN....328..889K. doi: 10.1002/asna.200710776. S2CID  119323941.
  7. ^ a b c d e f g North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv: astro-ph/9802286, Bibcode: 1998A&A...334..181N
  8. ^ a b c d e Perraut, K.; et al. (October 2020), "Benchmarking the fundamental parameters of Ap stars with optical long-baseline interferometric measurements", Astronomy & Astrophysics, 642: 13, Bibcode: 2020A&A...642A.101P, doi: 10.1051/0004-6361/202038753, A101.
  9. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154. Bibcode: 2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146. S2CID  33401607.
  10. ^ "HD 3167". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 6, 2018.
  11. ^ VSX (4 January 2010). "GO Andromedae". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 May 2014.
  12. ^ Panek, R. J. (October 1980). "Periodic spectral variability of the AP star HR 234". Astronomy and Astrophysics. 90 (3): 341–343. Bibcode: 1980A&A....90..341P.
  13. ^ Bohlender, D. A. (August 1989). "The magnetic field and rotation period of the AP star HD 4778". Astronomy and Astrophysics. 220: 215–217. Bibcode: 1989A&A...220..215B.
Retrieved from " https://en.wikipedia.org/?title=HD_4778&oldid=1191222355"
From Wikipedia, the free encyclopedia
(Redirected from GO Andromedae)
HD 4778

A light curve for GO Andromedae, plotted from TESS data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda
Right ascension 00h 50m 18.26563s [2]
Declination +45° 00′ 08.1439″ [2]
Apparent magnitude (V) 6.13 [3]
Characteristics
Spectral type A3VpSiSrCrEuKsn [4]
B−V color index 0.043±0.004 [3]
Variable type α2 CVn [5]
Astrometry
Radial velocity (Rv)1.60 [6] km/s
Proper motion (μ) RA: 65.353 [2]  mas/ yr
Dec.: 4.133 [2]  mas/ yr
Parallax (π)9.3224 ± 0.0916  mas [2]
Distance350 ± 3  ly
(107 ± 1  pc)
Absolute magnitude (MV)1.18 [7]
Details
Mass2.24±0.09 [7]  M☉
Radius2.36±0.12 [8]  R☉
Luminosity34.9±4.3 [8]  L☉
Surface gravity (log g)4.12±0.09 [7]  cgs
Temperature9,135±400 [8]  K
Rotation2.5616 [7] days
Rotational velocity (v sin i)33 [4] km/s
Age77 [9]  Myr
Other designations
GO Andromedae, BD+44° 176, FK5 2055, HD 4778, HIP 3919, HR 234, SAO 36702, PPM 43369 [10]
Database references
SIMBAD data

HD 4778, also known as HR 234 and GO Andromedae, is a variable star in the constellation Andromeda. Its magnitude varies by 0.04 magnitudes from the median of 6.12 with a period of approximately 2.55 days. [11] The star is located 350  light years away, as determined from its annual parallax shift of 9.32  mas. [2]

This is an Ap star with a stellar classification of A3VpSiSrCrEuKsn, [4] showing chemical peculiarities in its spectrum from strontium, chromium, and europium. [12] It is an Alpha2 Canum Venaticorum variable [5] with a magnetic field that varies across the range +1,400 to −1,100  G. [13] This rotation-modulated variability allows direct determination of the rotation rate of 2.5616 days. [7]

HD 4778 has 2.24 [7] times the mass of the Sun and 2.36 [8] times the Sun's radius. The star is radiating 35 [8] times the Sun's luminosity from its photosphere at an effective temperature of 9,375 K. [7] It is about 77 [9] million years old.

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051.
  3. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID  119257644.
  4. ^ a b c Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182.
  5. ^ a b Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General Catalogue of Variable Stars". Astronomy Reports. GCVS 5.1. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. S2CID  125853869.
  6. ^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv: 0705.0878. Bibcode: 2007AN....328..889K. doi: 10.1002/asna.200710776. S2CID  119323941.
  7. ^ a b c d e f g North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv: astro-ph/9802286, Bibcode: 1998A&A...334..181N
  8. ^ a b c d e Perraut, K.; et al. (October 2020), "Benchmarking the fundamental parameters of Ap stars with optical long-baseline interferometric measurements", Astronomy & Astrophysics, 642: 13, Bibcode: 2020A&A...642A.101P, doi: 10.1051/0004-6361/202038753, A101.
  9. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv: 1501.03154. Bibcode: 2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146. S2CID  33401607.
  10. ^ "HD 3167". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 6, 2018.
  11. ^ VSX (4 January 2010). "GO Andromedae". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 May 2014.
  12. ^ Panek, R. J. (October 1980). "Periodic spectral variability of the AP star HR 234". Astronomy and Astrophysics. 90 (3): 341–343. Bibcode: 1980A&A....90..341P.
  13. ^ Bohlender, D. A. (August 1989). "The magnetic field and rotation period of the AP star HD 4778". Astronomy and Astrophysics. 220: 215–217. Bibcode: 1989A&A...220..215B.
Retrieved from " https://en.wikipedia.org/?title=HD_4778&oldid=1191222355"

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