Related Research Articles
HD 28185 is a yellow dwarf star similar to the Sun located 128 light-years away from Earth in the constellation Eridanus. The designation HD 28185 refers to its entry in the Henry Draper catalogue. The star is known to possess one long-period extrasolar planet.
RT Aurigae is a yellow supergiant variable star in the constellation Auriga, about 1,500 light years from Earth.
BPS CS22892-0052 is an old population II star located at a distance of 4.7 kiloparsecs in the Milky Way's galactic halo. It belongs to a class of ultra-metal-poor stars, specifically the very rare subclass of neutron-capture (r-process) enhanced stars. It was discovered by Tim C. Beers and collaborators with the Curtis Schmidt telescope at the Cerro Tololo Inter-American Observatory in Chile. Extended high-resolution spectroscopic observations since around 1995 allowed observers to determine the abundances of 53 chemical elements in this star, as of December 2005 only second in number to the Sun.
HD 222582 is a multiple star system in the equatorial constellation of Aquarius. It is invisible to the naked eye with an apparent visual magnitude of 7.7, but can be viewed with binoculars or a small telescope. The system is located at a distance of 137 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +12 km/s. It is located close enough to the ecliptic that it is subject to lunar occultations.
HD 30177 is a single star with a pair of orbiting exoplanets in the southern constellation Dorado. Based on parallax measurements, it is located at a distance of 181 light years from the Sun. It has an absolute magnitude of 4.72, but at that distance the star is too faint to be viewed by the naked eye with an apparent visual magnitude of 8.41. The star is drifting further away with a radial velocity of 62.7 km/s.
HD 115404 is a binary star system located in the constellation Coma Berenices. Parallax measurements made by Hipparcos put the system at 36 light-years, or 11 parsecs, away. The combined apparent magnitude of the system is 6.52, with the magnitudes of the components being 6.66 and 9.50.
HD 224635 and HD 224636 is a pair of stars comprising a binary star system in the constellation Andromeda. They are located approximately 94 light years away and they orbit each other every 717 years.
HD 1185 is a double star in the northern constellation of Andromeda. The primary, with an apparent magnitude of 6.15, is a white main-sequence star of spectral type A2VpSi, indicating it has stronger silicon absorption lines than usual, thus making it also an Ap star. The secondary companion, which is 9.08 arcseconds away, is not visible to the naked eye at an apparent magnitude of 9.76. It shares common proper motion and parallax with the primary star but orbital parameters are still unknown.
HD 7853 is a double star in the constellation Andromeda. With an apparent magnitude of 6.46, it can barely be seen with the naked eye even on the best of nights. The system is located approximately 130 parsecs (420 ly) distant, and the brighter star is an Am star, meaning that it has unusual metallic absorption lines. The spectral classification of kA5hF1mF2 means that it would have a spectral class of A5 if it were based solely on the calcium K line, F2 if based on the lines of other metals, and F1 if based on the hydrogen absorption lines. The two components are six arc-seconds apart and the secondary is three magnitudes fainter than the primary.
HD 6114 is a visual binary star system in the northern constellation of Andromeda. With a combined apparent magnitude of 6.46, the star can only be seen with the naked eye by keen-eyed observers even on the best of nights. Based upon an annual parallax shift of 10.4 mas as seen from Earth's orbit, the system is located approximately 108 parsecs (350 ly) distant.
HD 222399 is a double star in the northern constellation of Andromeda. The magnitude 6.57 primary is an F-type subgiant star with a stellar classification of F2IV. It has a magnitude 10.57 companion at an angular separation of 14.7″ along a position angle of 162°.
HD 92589 is a double star in the constellation Antlia. The system has a combined apparent magnitude of 6.39, placing it near the limit of naked eye visibility. The system is located about 590 light years away based on its parallax shift and has a heliocentric radial velocity of 11 km/s. This indicates that it is drifting away from the Solar System.
HD 126614 is a trinary star system in the equatorial constellation of Virgo. The primary member, designated component A, is host to an exoplanetary companion. With an apparent visual magnitude of 8.81, it is too faint to be seen with the naked eye. The system is located at a distance of 239 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −33 km/s.
HD 165634 is a star in the southern constellation of Sagittarius. It has a yellow hue and is faintly visible to the naked eye with apparent visual magnitude of 4.56. The star is located at a distance of approximately 339 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −5 km/s. It has an absolute magnitude of −0.53.
HD 140283 is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
HD 126053 is the Henry Draper Catalogue designation for a star in the equatorial constellation of Virgo. It has an apparent magnitude of 6.25, which means it is faintly visible to the naked eye. According to the Bortle scale, it requires dark suburban or rural skies to view. Parallax measurements made by the Hipparcos spacecraft provide an estimated distance of 57 light years to this star. It is drifting closer with a heliocentric radial velocity of −19.2 km/s.
HD 193322 is a group of six stars which appear to be at least loosely bound into a system in the constellation Cygnus. The stars comprise the core of the young open cluster Collinder 419, which contains a total of 51 known stars. Another prominent member of the cluster is the eclipsing binary star V470 Cygni. The cluster lies at a distance of about 3500 light years and its stars are only a few million years old.
HD 26764, also known as HR 1314 or rarely 14 H. Camelopardalis, is a solitary white hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.19, making it faintly to the naked eye if viewed under good conditions. Gaia DR3 parallax measurements place the object at a distance of 266 light years and is drifting closer with a poorly constrained heliocentric radial velocity of 3 km/s. At its current distance, HD 26764's brightness is diminished by 0.26 magnitudes due to interstellar dust.
HD 27022, also known as HR 1327, is a star located in the northern circumpolar constellation Camelopardalis. The object has also been designated as 20 H. Camelopardalis, but is not commonly used in modern times. It has an apparent magnitude of 5.27, allowing it to be faintly visible to the naked eye. Based on parallax measurements from Gaia DR3, the star has been estimated to be 347 light years away. It appears to be approaching the Solar System, having a heliocentric radial velocity of −19.5 km/s.
HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.
References
- 1 2 3 4 5 6 7 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.
- 1 2 3 Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
- 1 2 Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373
- ↑ NSV 6526
- ↑ Bonifacio, P.; et al. (July 2009), "First stars XII. Abundances in extremely metal-poor turnoff stars, and comparison with the giants", Astronomy and Astrophysics, 501 (2): 519–530, arXiv: 0903.4174 , Bibcode:2009A&A...501..519B, doi:10.1051/0004-6361/200810610, S2CID 119164253
- 1 2 3 4 5 Creevey, O. L.; Thévenin, F.; Boyajian, T. S.; Kervella, P.; Chiavassa, A.; Bigot, L.; Mérand, A.; Heiter, U.; Morel, P.; Pichon, B.; Mc Alister, H. A.; Ten Brummelaar, T. A.; Collet, R.; Van Belle, G. T.; Coudé Du Foresto, V.; Farrington, C.; Goldfinger, P. J.; Sturmann, J.; Sturmann, L.; Turner, N. (2012). "Fundamental properties of the Population II fiducial stars <ASTROBJ>HD 122563</ASTROBJ> and <ASTROBJ>GMB 1830</ASTROBJ> from CHARA interferometric observations". Astronomy and Astrophysics. 545. arXiv: 1207.5954 . Bibcode:2012A&A...545A..17C. doi:10.1051/0004-6361/201219651. S2CID 16387931.
- 1 2 De Medeiros, J. R.; Silva, J. R. P.; Do Nascimento, J. D.; Canto Martins, B. L.; Da Silva, L.; Melo, C.; Burnet, M. (2006). "A catalog of rotational and radial velocities for evolved stars. IV. Metal-poor stars^". Astronomy and Astrophysics. 458 (3): 895. arXiv: astro-ph/0608248 . Bibcode:2006A&A...458..895D. doi:10.1051/0004-6361:20065642. S2CID 54046583.
- ↑ Wallerstein, G.; Greenstein, J. L.; Parker, R.; Helfer, H. L.; Aller, L. H. (1963), "Red Giants with Extreme Metal Deficiencies", Astrophysical Journal, 137: 280–300, Bibcode:1963ApJ...137..280W, doi: 10.1086/147501
- ↑ Lambert, D. L.; Sneden, C.; Ries, L. M. (1974), "The oxygen abundance in the metal-deficient star HD 122563", Astrophysical Journal, 188: 97–100, Bibcode:1974ApJ...188...97L, doi:10.1086/152690
- ↑ Sneden, C.; Parthasarathy, M. (1983), "The r- and s-process nuclei in the early history of the galaxy - HD 122563", Astrophysical Journal, 267: 757–778, Bibcode:1983ApJ...267..757S, doi: 10.1086/160913
