HD 221148
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K-type suspected variable star in the constellation Aquarius
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 29m 32.08207s[1] |
| Declination | −04° 31′ 57.8915″[1] |
| Apparent magnitude (V) | 6.26[2] |
| Characteristics | |
| Spectral type | K3IIIv[3] |
| U−B color index | +1.20[2] |
| B−V color index | +1.10[2] |
| Astrometry | |
| Radial velocity (Rv) | −26.53±1.94[3] km/s |
| Proper motion (μ) | RA: +181.03[1] mas/yr Dec.: −232.23[1] mas/yr |
| Parallax (π) | 21.14 ± 0.56 mas [1] |
| Distance | 154 ± 4 ly (47 ± 1 pc) |
| Details | |
| Radius | 5[3] R☉ |
| Luminosity | 8.9[3] L☉ |
| Surface gravity (log g) | 3.1[3] cgs |
| Temperature | 4,592[3] K |
| Metallicity [Fe/H] | +0.11[3] dex |
| Rotational velocity (v sin i) | 2.2[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 221148 is suspected variable star in the equatorial constellation of Aquarius. The spectrum of the star shows exceptionally strong levels of CN; one of the highest cyanogen indices measured.[4]
References
[edit ]- ^ a b c d e 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.
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- ^ a b c d e f g h Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
- ^ Janes, K. A. (May 1975), "Cyanogen Strengths, Luminosities, and Kinematics of K Giant Stars", Astrophysical Journal Supplement, 29: 161–183, Bibcode:1975ApJS...29..161J, doi:10.1086/190339 . See p. 179.
{{citation}}: CS1 maint: postscript (link)
External links
[edit ]- HR 8924 Catalog
- Image HD 221148
