V1339 Aquilae, also known as HD 187567, is a Be star in the constellation Aquila. At its brightest its apparent magnitude is 6.22,[3] making it barely visible to the naked eye at a location with very little light pollution. It is located just 8 arc seconds from the center of the open cluster NGC 6828.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 50m 17.47943s |
| Declination | +07° 54′ 08.6934″ |
| Apparent magnitude (V) | 6.484 |
| Characteristics | |
| Spectral type | B2.5IVe |
| U−B color index | -0.7 |
| B−V color index | -0.1 |
| Variable type | Be star |
| Astrometry | |
| Radial velocity (Rv) | -30.10 ± 5 km/s |
| Proper motion (μ) | RA: -0.77 ± 0.39 mas/yr Dec.: -5.44 ± 0.46 mas/yr |
| Parallax (π) | 1.89 ± 0.45 mas |
| Distance | approx. 1,700 ly (approx. 500 pc) |
| Details | |
| Mass | 13.0[2] M☉ |
| Radius | 7.7[2] R☉ |
| Temperature | 23310[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
V1339 Aquilae was discovered to be a Be star in 1925 by P. W. Merrill, M. L. Humason and C. G. Burwell.[5] The star's variability was detected in 1966 by A. W. J. Cousins, R. Lake and R. H. Stoy,[6] and because of this it was given its variable star designation, V1339 Aquilae, in 1979.[7]
V1339 Aquilae is around 13 times as massive as the Sun and has 7.7 times its diameter.[2] Its binary nature was discovered by speckle interferometry in 1983, at the Kitt Peak 4 meter telescope. At the time of these speckle observations the stars were separated by 0.057 arc seconds.[8]
References
edit- ^ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997HIP...C......0E. ISBN 9290923997. Retrieved 15 October 2022.
- ^ a b c d Catanzaro, G. (2013). "Spectroscopic atlas of Hα and Hβ in a sample of northern Be stars". Astronomy & Astrophysics. 550: 18. arXiv:1212.6608. Bibcode:2013A&A...550A..79C. doi:10.1051/0004-6361/201220357. A79.
- ^ "General Catalogue of Variable stars". General Catalogue of Variable stars. Lomonosov Moscow State University. Retrieved 27 August 2024.
- ^ Zejda, M.; Paunzen, E.; Baumann, B.; Mikulášek, Z.; Liška, J. (December 2012). "Catalogue of variable stars in open cluster fields" (PDF). Astronomy & Astrophysics. 548: A97–A102. Bibcode:2012A&A...548A..97Z. doi:10.1051/0004-6361/201219186. Retrieved 27 August 2024.
- ^ Merrill, Paul W.; Humason, Milton L.; Burrell, Cora G. (June 1925). "Discovery and Observations of Stars of Class Be". Astrophysical Journal. 61: 389–417. Bibcode:1925ApJ....61..389M. doi:10.1086/142899. Retrieved 27 August 2024.
- ^ Cousins, A. W. J.; Lake, R.; Stoy, R. H. (1966). "Photoelectric magnitudes and colours of southern stars, II". Royal Observatory bulletins (121). Bibcode:1966RGOB..121....1C. Retrieved 27 August 2024.
- ^ Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (April 1979). "64th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars (1581): 1–8. Bibcode:1979IBVS.1581....1K. Retrieved 27 August 2024.
- ^ McAlister, Harold A.; Hartkopf, William I. H.; Hutter, Donald J.; Franz, Otto G. (March 1987). "ICCD Speckle Observations of Binary Stars. II. Measurements During 1982 -1985 from the Kitt Peak 4 m Telescope". Astronomical Journal. 93: 688–777. Bibcode:1987AJ.....93..688M. doi:10.1086/114353. Retrieved 27 August 2024.
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