Star in the constellation Lynx
Location of 5 Leonis Minoris (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 08 50 32.22282 |
| Declination | +33° 17′ 06.1959″ |
| Apparent magnitude (V) | 6.210 |
| Characteristics | |
| Evolutionary stage | Main-sequence star |
| Spectral type | F7V |
| B−V color index | 0.528 |
| J−H color index | 0.151 |
| J−K color index | 0.227 |
| Astrometry | |
| Radial velocity (Rv) | 4.212±0.0015 km/s |
| Proper motion (μ) | RA: −63.320 mas/yr Dec.: −83.552 mas/yr |
| Parallax (π) | 36.5201 ± 0.0252 mas |
| Distance | 89.31 ± 0.06 ly (27.38 ± 0.02 pc) |
| Absolute magnitude (MV) | 3.93±0.05 |
| Details | |
| Mass | 1.211+0.026 −0.020 M☉ |
| Radius | 1.24+0.05 −0.03 R☉ |
| Luminosity | 2.11±0.10 L☉ |
| Surface gravity (log g) | 4.34±0.03 cgs |
| Temperature | 6258±44 K |
| Metallicity | 0.24±0.03 dex |
| Rotation | 3.56+0.11 −0.14 d |
| Rotational velocity (v sin i) | 9±0.5 km/s |
| Age | 1.88+0.72 −0.92 Gyr |
| Other designations | |
| AG+33° 897, BD+33° 1765, Gaia DR2 1491593733326694912, Gaia DR3 716109930305855360, GC 12187, HD 75332, HIP 43410, HR 3499, SAO 61074, PPM 74024, TIC 284898141, TYC 2488-849-1, GSC 02488-00849, 2MASS J08503222+3317061 | |
| Database references | |
| SIMBAD | data |
5 Leonis Minoris (5 LMi), commonly referred to as HD 75332, is a yellow-white star in the northern constellation of Lynx, close to the border with Cancer. With an apparent magnitude of 6.210, it is near the limit for naked eye observation, and can be seen faintly under very dark skies. As such, the Bright Star Catalogue lists it as HR 3499. It is located at a distance of 89.31 light-years (27.38 parsecs) according to Gaia EDR3 parallax measurements, and is moving farther away at a heliocentric radial velocity of 4.212 km/s.
Properties
This is an ordinary F-type main-sequence star with the stellar classification F7V, meaning it is fusing hydrogen into helium at its core to generate energy. It is 24% larger than the Sun and 21% more massive, emitting 2.11 times the luminosity of the Sun from its photosphere at an effective temperature of 6,258 K (5,985 °C; 10,805 °F). It is roughly 40% the age of the Solar System at 1.88 billion years old. Its physical properties are similar to that of some of the hotter exoplanet-hosting stars, such as Iota Horologii, HD 52265, and HD 209458.
Compared to the Sun, the star is overall slightly more enriched in elements heavier than hydrogen and helium, with a metallicity measured at = 0.05±0.03 dex (i.e., 12±8 % richer). It is about 120 times richer in lithium (=2.08±0.05 dex), and also substantially enhanced in calcium, scandium, titanium, iron, and nickel, but somewhat poor in nitrogen (10 ≈ 78% the solar abundance). Due to its high metal content, it was predicted in 2001 that a giant planet will almost certainly be found around 5 LMi. Likewise, a 2019 paper gave a 65% chance that the star is orbited by a planet with a mass greater than 0.0945 MJ. However, no exoplanets have been discovered in orbit as of January 2021.
Stellar activity
In 2019, the star was discovered to exhibit cyclical chromospheric activity, measured by the Mount Wilson S-index, with a period of approximately 180 days. This is much shorter than the 11-year activity cycle of the Sun and bears resemblance to that displayed by other F-type stars including Tau Boötis, HD 16673, HD 49933, and 89 Leonis. A follow-up study in 2021 confirmed the short-term periodicity (~193.5 days), together with two longer cycles each lasting ~3.9 years and ~31.5 years. Additionally, their observations of the stellar magnetic field showed a rapid cycle with a period of approximately 1.06 years, also much shorter than the Sun's. In this regard it is again akin to τ Boo, which harbors a hot Jupiter (b), whereas 5 LMi does not. Such cycles are probably innate to late F-type stars and caused by their thin convection zones.
See also
Notes
- Calculated from absolute magnitude.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Høg, E.; et al. (February 2000). "The Tycho-2 Catalogue of the 2.5 Million Brightest Stars". Astronomy and Astrophysics. 355 (1): L27 – L30. Bibcode:2000A&A...355L..27H.
- ^ Brown, E L; Marsden, S C; Mengel, M W; Jeffers, S V; Millburn, I; Mittag, M; Petit, P; Vidotto, A A; Morin, J; See, V; Jardine, M; González-Pérez, J N; The BCool Collaboration (14 January 2021). "Magnetic field and chromospheric activity evolution of HD 75332: a rapid magnetic cycle in an F star without a hot Jupiter". Monthly Notices of the Royal Astronomical Society. 501 (3): 3981–4003. doi:10.1093/mnras/staa3878. ISSN 0035-8711. Retrieved 26 December 2024.
This article incorporates text from this source, which is available under the CC BY 4.0 license.
- ^ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- 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. Gaia DR2 record for this source at VizieR.
- ^ Gonzalez, Guillermo; Laws, Chris; Tyagi, Sudhi; Reddy, B. E. (2001). "Parent Stars of Extrasolar Planets. VI. Abundance Analyses of 20 New Systems". The Astronomical Journal. 121 (1): 432–452. doi:10.1086/318048. Retrieved 26 December 2024.
- "HD 75332". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 January 2025.
- Hinkel, Natalie R.; Unterborn, Cayman; Kane, Stephen R.; Somers, Garrett; Galvez, Richard (24 July 2019). "A Recommendation Algorithm to Predict Giant Exoplanet Host Stars Using Stellar Elemental Abundances". The Astrophysical Journal. 880 (1): 49. doi:10.3847/1538-4357/ab27c0. ISSN 1538-4357. Record for this source at VizieR.
- Mittag, M.; Schmitt, J. H. M. M.; Hempelmann, A.; Schröder, K.-P. (2019). "Discovery of short-term activity cycles in F-type stars" (PDF). Astronomy & Astrophysics. 621: A136. doi:10.1051/0004-6361/201834319. ISSN 0004-6361. Retrieved 26 December 2024.
