astro.wikisort.org - Star17 Lyrae is a multiple star system in the constellation Lyra, approximately 136 light years away from Earth.
Star in the constellation Lyra
17 Lyrae AB
Location of 17 Lyrae (circled) |
Observation data Epoch J2000.0 Equinox J2000.0 |
Constellation |
Lyra |
AB |
Right ascension |
19h 07m 25.58012s[1] |
Declination |
+32° 30′ 6.2599″[1] |
Apparent magnitude (V) |
5.221[2] |
A |
Right ascension |
19h 07m 25.5s[3] |
Declination |
+32° 30′ 07″[3] |
Apparent magnitude (V) |
5.26[3] |
B |
Right ascension |
19h 07m 24.9s[4] |
Declination |
+32° 30′ 07″[4] |
Apparent magnitude (V) |
9.1[4] |
Characteristics |
Spectral type |
F0V[5] |
U−B color index |
+0.044[6] |
B−V color index |
+0.351[6] |
Astrometry |
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AB |
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Radial velocity (Rv) | 4.0[7] km/s |
Proper motion (μ) | RA: 122.42[1] mas/yr Dec.: 32.36[1] mas/yr |
Parallax (π) | 24.05 ± 0.31 mas[1] |
Distance | 136 ± 2 ly (41.6 ± 0.5 pc) |
|
Orbit[8] |
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Primary | A |
Period (P) | 42.857 days |
Eccentricity (e) | 0.0 |
Semi-amplitude (K1) (primary) | 13.10 km/s |
Details |
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A |
---|
Mass | 1.6[8] M☉ |
Luminosity | 16.4[9] L☉ |
Surface gravity (log g) | 3.57[6] cgs |
Temperature | 6,887[9] K |
Metallicity [Fe/H] | 0.0[10] dex |
Rotational velocity (v sin i) | 138[9] km/s |
Age | 1.4[10] Gyr |
|
Other designations |
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17 Lyrae, HR 7261, BD+32°3326, HD 178449, SAO 67835, HIP 93917, GC 26340, CCDM J19075+3231, IDS 19036+3221 |
Database references |
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SIMBAD | data |
Components
The 17 Lyrae system contains two visible components, designated A and B, separated by 2.48" in 1997. The primary star is a single-lined spectroscopic binary with a period of 42.9 days.[6]
There was once thought to be a fourth star in the system, the red dwarf binary Kuiper 90, designated 17 Lyrae C, until it was evident that the star's parallax and proper motions were too different for it to be part of the system.[11] The separation between 17 Lyrae AB and C is increasing rapidly, from less than 2' in 1881 to nearly 5' in 2014.[12]
A number of other visual companions have been catalogued. The closest is the 11th magnitude star at 39", and the brightest is BD+32 3325 just over 2' away.[12]
Properties
The primary component, 17 Lyrae A, is a 5th magnitude main sequence star of the spectral type F0, meaning it has a surface temperature of about 6,750 K. It is about 60% more massive than the sun and 16 times more luminous. It has been catalogued as an Am star but is now believed to be a relatively normal quickly-rotating star.[6]
The visible companion 17 Lyrae B is a 9th magnitude star of an unknown spectral type. The spectroscopic companion cannot be detected in the spectrum and its properties are uncertain. Faint sharp spectral lines contrasting with the broadened lines of the primary may originate in a shell of material around the stars.[6]
References
- Van Leeuwen, F (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- Høg, E; Fabricius, C; Makarov, V. V; Urban, S; Corbin, T; Wycoff, G; Bastian, U; Schwekendiek, P; Wicenec, A (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
- "CCDM Vizier entry". Retrieved 2017-11-29.
- "CCDM Vizier entry". Retrieved 2017-11-29.
- Cowley, Anne; Fraquelli, Dorothy (1974). "MK Spectral Types for Some Bright F Stars". Publications of the Astronomical Society of the Pacific. 86 (509): 70. Bibcode:1974PASP...86...70C. doi:10.1086/129562.
- Budaj, J; Iliev, I. Kh (2003). "Abundance analysis of Am binaries and search for tidally driven abundance anomalies - I. HD 33254, HD 178449 and HD 198391". Monthly Notices of the Royal Astronomical Society. 346 (1): 27–36. Bibcode:2003MNRAS.346...27B. doi:10.1046/j.1365-2966.2003.07071.x.
- Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- Ducati, J. R; Penteado, E. M; Turcati, R (2011). "The mass ratio and initial mass functions in spectroscopic binaries" (PDF). Astronomy and Astrophysics. 525: A26. Bibcode:2011A&A...525A..26D. doi:10.1051/0004-6361/200913895.
- Zorec, J; Royer, F (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. S2CID 55586789.
- Trilling, D. E; Stansberry, J. A; Stapelfeldt, K. R; Rieke, G. H; Su, K. Y. L; Gray, R. O; Corbally, C. J; Bryden, G; Chen, C. H; Boden, A; Beichman, C. A (2007). "Debris disks in main-sequence binary systems". The Astrophysical Journal. 658 (2): 1289–1311. arXiv:astro-ph/0612029. Bibcode:2007ApJ...658.1289T. doi:10.1086/511668. S2CID 14867168.
- Slocum, Frederick (1929). "The parallax of 17 Lyrae C (abstract)". Popular Astronomy. 37: 328. Bibcode:1929PA.....37..328S.
- Mason, Brian D; Wycoff, Gary L; Hartkopf, William I; Douglass, Geoffrey G; Worley, Charles E (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
External links
Constellation of Lyra |
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Stars | |
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Galaxies |
- NGC 6606
- NGC 6612
- NGC 6640
- NGC 6646
- NGC 6657
- NGC 6662
- NGC 6663
- NGC 6665
- NGC 6671
- NGC 6672
- NGC 6675
- NGC 6685
- NGC 6686
- NGC 6688
- NGC 6692
- NGC 6695
- NGC 6700
- NGC 6702
- NGC 6703
- NGC 6710
- NGC 6713
- NGC 6740
- NGC 6745
- NGC 6765
- NGC 6792
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 Category |
На других языках
- [en] 17 Lyrae
[ru] 17 Лиры
17 Лиры (17 Lyr) — двойная звезда в созвездии Лиры, находящаяся на расстоянии приблизительно 132 световых лет от Земли. Главная звезда имеет пятую звёздную величину, спектральный класс F0V и температуру поверхности 7500 К[2][3]. Бело-жёлтый карлик, размером приблизительно с Солнце, но ярче и горячее. Компаньон имеет девятую звёздную величину, спектральный класс неизвестен. Звезда Глизе 747AB (или Койпер 90) считалась третьим компаньоном системы (17 Лиры С), пока не стало очевидно, что параллаксы и собственное движение слишком сильно отличаются для кратной системы[4].
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