  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 30m 06.44761s [1] |
| Declination | +38° 55′ 30.4758″ [1] |
| Apparent magnitude (V) | 5.78±0.01 [2] |
| Characteristics | |
| Evolutionary stage | subgiant [3] |
| Spectral type | A4 V [4] or A4 III [5] |
| U−B color index | +0.14 [5] |
| B−V color index | +0.07 [5] |
| Astrometry | |
| Radial velocity (Rv) | 2±4.3 [6] km/s |
| Proper motion (μ) |
RA: −16.446
mas/
yr
[1] Dec.: −4.506 mas/ yr [1] |
| Parallax (π) | 4.4749 ± 0.0527 mas [1] |
| Distance | 729 ± 9
ly (223 ± 3 pc) |
| Absolute magnitude (MV) | −1.02 [7] |
| Details | |
| Mass | 2.01±0.39 [8] M☉ |
| Radius | 6.58±0.33 [9] R☉ |
| Luminosity | 241+41 −35 [3] L☉ |
| Surface gravity (log g) | 3.07±0.37 [8] cgs |
| Temperature | 8,511+79 −78 [3] K |
| Metallicity [Fe/H] | −0.80 [10] dex |
| Rotational velocity (v sin i) | 70±8 [11] km/s |
| Age | 465 [12] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
32 Leonis Minoris (32 LMi), also known as HD 90840, is a solitary star [14] located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.78. [2] The object is located relatively far at a distance of 729 light-years based on Gaia DR3 parallax measurements [1] and it is currently receding with a heliocentric radial velocity of 2 km/s, [6] which is somewhat constrained. At its current distance, 32 LMi's brightness is diminished by 0.14 magnitudes due to interstellar extinction [15] and it has an absolute magnitude of −1.02. [7]
The object has been given several stellar classifications over the years, ranging from main sequence (V) to giant star (III) and A1 to A4. Two of the classifications are A4 V [4] and A4 III. [5] It has 2.01 times the mass of the Sun [8] but at the age of 465 million years, [12] 32 LMi is now on the subgiant branch [8][ failed verification] and it has expanded to 6.58 times the radius of the Sun. [9] It radiates 241 times the luminosity of the Sun [3] from its photosphere at an effective temperature of 8,511 K. [3] 32 LMi is metal deficient with an iron abundance only 15.9% that of Sun ([Fe/H] = −0.80) [10] and it spins modestly with a projected rotational velocity of 70 km/s. [11]
References
- ^ a b c d e 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.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ a b c d e Zorec, J.; Royer, F. (January 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. eISSN 1432-0746. ISSN 0004-6361. S2CID 55586789.
- ^ a b Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode: 1969AJ.....74..375C. doi: 10.1086/110819. ISSN 0004-6256. S2CID 121555804.
- ^ a b c d Osawa, Kiyoteru (July 1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". The Astrophysical Journal. 130. American Astronomical Society: 159. Bibcode: 1959ApJ...130..159O. doi: 10.1086/146706. ISSN 0004-637X. S2CID 120004061.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv: 1706.00495. Bibcode: 2018AJ....156..102S. doi: 10.3847/1538-3881/aad050. eISSN 1538-3881. S2CID 73582386. (Erratum: doi: 10.3847/1538-3881/AADE86)
- ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912. Bibcode: 2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN 0067-0049. S2CID 120495962.
- ^ a b Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737. S2CID 118345778.
- ^ "32 Leonis Minoris". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 29, 2023.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
- ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
| |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 30m 06.44761s [1] |
| Declination | +38° 55′ 30.4758″ [1] |
| Apparent magnitude (V) | 5.78±0.01 [2] |
| Characteristics | |
| Evolutionary stage | subgiant [3] |
| Spectral type | A4 V [4] or A4 III [5] |
| U−B color index | +0.14 [5] |
| B−V color index | +0.07 [5] |
| Astrometry | |
| Radial velocity (Rv) | 2±4.3 [6] km/s |
| Proper motion (μ) |
RA: −16.446
mas/
yr
[1] Dec.: −4.506 mas/ yr [1] |
| Parallax (π) | 4.4749 ± 0.0527 mas [1] |
| Distance | 729 ± 9
ly (223 ± 3 pc) |
| Absolute magnitude (MV) | −1.02 [7] |
| Details | |
| Mass | 2.01±0.39 [8] M☉ |
| Radius | 6.58±0.33 [9] R☉ |
| Luminosity | 241+41 −35 [3] L☉ |
| Surface gravity (log g) | 3.07±0.37 [8] cgs |
| Temperature | 8,511+79 −78 [3] K |
| Metallicity [Fe/H] | −0.80 [10] dex |
| Rotational velocity (v sin i) | 70±8 [11] km/s |
| Age | 465 [12] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
32 Leonis Minoris (32 LMi), also known as HD 90840, is a solitary star [14] located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.78. [2] The object is located relatively far at a distance of 729 light-years based on Gaia DR3 parallax measurements [1] and it is currently receding with a heliocentric radial velocity of 2 km/s, [6] which is somewhat constrained. At its current distance, 32 LMi's brightness is diminished by 0.14 magnitudes due to interstellar extinction [15] and it has an absolute magnitude of −1.02. [7]
The object has been given several stellar classifications over the years, ranging from main sequence (V) to giant star (III) and A1 to A4. Two of the classifications are A4 V [4] and A4 III. [5] It has 2.01 times the mass of the Sun [8] but at the age of 465 million years, [12] 32 LMi is now on the subgiant branch [8][ failed verification] and it has expanded to 6.58 times the radius of the Sun. [9] It radiates 241 times the luminosity of the Sun [3] from its photosphere at an effective temperature of 8,511 K. [3] 32 LMi is metal deficient with an iron abundance only 15.9% that of Sun ([Fe/H] = −0.80) [10] and it spins modestly with a projected rotational velocity of 70 km/s. [11]
References
- ^ a b c d e 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.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ a b c d e Zorec, J.; Royer, F. (January 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. eISSN 1432-0746. ISSN 0004-6361. S2CID 55586789.
- ^ a b Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode: 1969AJ.....74..375C. doi: 10.1086/110819. ISSN 0004-6256. S2CID 121555804.
- ^ a b c d Osawa, Kiyoteru (July 1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". The Astrophysical Journal. 130. American Astronomical Society: 159. Bibcode: 1959ApJ...130..159O. doi: 10.1086/146706. ISSN 0004-637X. S2CID 120004061.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv: 1706.00495. Bibcode: 2018AJ....156..102S. doi: 10.3847/1538-3881/aad050. eISSN 1538-3881. S2CID 73582386. (Erratum: doi: 10.3847/1538-3881/AADE86)
- ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912. Bibcode: 2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN 0067-0049. S2CID 120495962.
- ^ a b Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814. Bibcode: 2012AstL...38..771G. doi: 10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737. S2CID 118345778.
- ^ "32 Leonis Minoris". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 29, 2023.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
- ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.