Lacaille 8760

	Lacaille 8760
Observationsdata; Epok: J2000.0
Stjärnbild	Mikroskopet
Rektascension	21t 17m 15,269 s
Deklination	-38° 52′ 02,51 ″
Skenbar magnitud ()	+6,67
Stjärntyp
Spektraltyp	M0 Ve
U–B	+1,165
B–V	+1,395
Variabeltyp	Flarestjärna
Astrometri
Radialhastighet ()	+20,7 km/s
Egenrörelse (µ)	RA: -3 258,553 mas/år; Dek.: -1 145,396 mas/år
Parallax ()	251,9124 ± 0,0352
Avstånd	12,947 ± 0,002 lå (3,9696 ± 0,0006 pc)
Absolut magnitud ()	+8,69
Detaljer
Massa	0,60 M☉
Radie	0,51 R☉
Luminositet	0,072 L☉
Temperatur	3 800 K
Metallicitet	-0,01 ± 0,04
Vinkelhastighet	3,3 km/s
Ålder	4,8 ± 2,9 miljarder år
Andra beteckningar
	HD 202560, AC2000 3462277, CD-39 14192, CPD-39 8920, 2E 4461, GJ 825, HIC 105090, HIP 105090, IRAS 21141-3904, LHS 66, 2MASS J21171534-3852022, NLTT 50917, PLX 5117, PPM 301208, 1RXS J211717.8-385150, SAO 212866, TYC 7966-1201-1, uvby98 100202560, AX Microscopii, WISEA J211712.39-385214.4, [GKL99] 404, Gaia DR3 6583272171336048640, Gaia DR2 6583272171335359360

Lacaille 8760 är en ensam stjärna i mellersta delen av stjärnbilden Mikroskopet som också har variabelbeteckningen AX Microscopii. Den har en skenbar magnitud av ca 6,67^[2] och kräver åtminstone en handkikare för att kunna observeras. Baserat på parallax enligt Gaia Data Release 3 på ca 251,9 mas,^[6] beräknas den befinna sig på ett avstånd på ca 12,9 ljusår (ca 4,0 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 21 km/s.^[4]

Egenskaper

Ljuskurva i ultravioletta bandet för AX Microscopii, plottad från Byrne (1981).^[12]

Lacaille 8760 är en röd dvärgstjärna i huvudserien av spektralklass M0 Ve^[3] och är en flarestjärna. Den har en massa som är ca 0,6^[2] solmassa, en radie som är ca 0,51^[7] solradie och har ca 0,072 gånger solens utstrålning av energi^[8] från dess fotosfär vid en effektiv temperatur av ca 3 800 K.^[9]

Trots ansträngningar från astronomer, hade fram till 2011 inga exoplaneter upptäckts i omloppsbana kring stjärnan.^[13]

Historik

Nummer 8760 tilldelades denna stjärna i 1847 års upplaga av Lacailles katalog med 9 766 stjärnor av Frans Baily.^[17]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Lacaille 8760, 8 juli 2022.

Noter

^ [a b c d] 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.
^ [a b c d e] "The One Hundred Nearest Star Systems", RECONS, Georgia State University, hämtad 2015-06-25.
^ [a b c d e] "V* AX Mic -- Flare Star", SIMBAD, Centre de Données astronomiques de Strasbourg, hämtad 2011-02-18.
^ [a b c d] Torres, C. A. O.; et al. (December 2006), "Search for associations containing young stars (SACY). I. Sample and searching method", Astronomy and Astrophysics, 460 (3): 695–708, arXiv:astro-ph/0609258, Bibcode:2006A&A...460..695T, doi:10.1051/0004-6361:20065602, S2CID 16080025. See the online data.
^ [a b] HIP 105090 (unistra.fr). Hämtad 2023-02-21.
^ [a b] 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.
^ [a b] Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235, Bibcode:2007ApJS..168..297T, doi:10.1086/509763, S2CID 18775378, hämtad 2011-08-26.
^ [a b] Moro-Martín, A.; et al. (March 2015). "Does the Presence of Planets Affect the Frequency and Properties of Extrasolar Kuiper Belts? Results from the Herschel Debris and Dunes Surveys". The Astrophysical Journal. 801 (2): 28. arXiv:1501.03813. Bibcode:2015ApJ...801..143M. doi:10.1088/0004-637X/801/2/143. S2CID 55170390.Vizier catalog entry
^ [a b] Gautier, Thomas N., III; et al. (September 2007), "Far-Infrared Properties of M Dwarfs", The Astrophysical Journal, 667 (1): 527–536, arXiv:0707.0464, Bibcode:2007ApJ...667..527G, doi:10.1086/520667, S2CID 15732144.
^ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604: A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715. S2CID 119216828.
^ Boehle, A.; et al. (October 2019), "Combining high-contrast imaging and radial velocities to constrain the planetary architectures of nearby stars", Astronomy & Astrophysics, 630: 17, arXiv:1907.04334, Bibcode:2019A&A...630A..50B, doi:10.1051/0004-6361/201935733, A50.
^ Byrne, P. B. (April 1981), "Gliese 825 - A new flare star", Monthly Notices of the Royal Astronomical Society, 195 (2): 143–147, Bibcode:1981MNRAS.195..143B, doi:10.1093/mnras/195.2.143.
^ Carson, J. C.; et al. (December 2011), "Low-mass evolution - Zero-age main sequence to asymptotic giant branch", The Astrophysical Journal, 743 (2): 141, arXiv:1110.2191, Bibcode:2011ApJ...743..141C, doi:10.1088/0004-637X/743/2/141, S2CID 119270911.
^ e-rara.ch. Johann Elert Bode. Uranographia star atlas (1801), Tabula XVI
^ Johann Elert Bode. Allgemeine Beschreibung und Nachweisung der Gestirne (1801), Page 67
^ Croswell, Ken (July 2003), "The Brightest Red Dwarf", Sky & Telescope: 32, hämtad 2011-02-18.
^ Francis Baily. A Catalogue of 9766 Stars (1847), Page 219

Externa länkar

[C-1] [a b c d] 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.

[D-2] [a b c d e] "The One Hundred Nearest Star Systems", RECONS, Georgia State University, hämtad 2015-06-25.

[E-3] [a b c d e] "V* AX Mic -- Flare Star", SIMBAD, Centre de Données astronomiques de Strasbourg, hämtad 2011-02-18.

[F-4] [a b c d] Torres, C. A. O.; et al. (December 2006), "Search for associations containing young stars (SACY). I. Sample and searching method", Astronomy and Astrophysics, 460 (3): 695–708, arXiv:astro-ph/0609258, Bibcode:2006A&A...460..695T, doi:10.1051/0004-6361:20065602, S2CID 16080025. See the online data.

[SIMBAD-5] [a b] HIP 105090 (unistra.fr). Hämtad 2023-02-21.

[G-6] [a b] 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.

[H-7] [a b] Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235, Bibcode:2007ApJS..168..297T, doi:10.1086/509763, S2CID 18775378, hämtad 2011-08-26.

[I-8] [a b] Moro-Martín, A.; et al. (March 2015). "Does the Presence of Planets Affect the Frequency and Properties of Extrasolar Kuiper Belts? Results from the Herschel Debris and Dunes Surveys". The Astrophysical Journal. 801 (2): 28. arXiv:1501.03813. Bibcode:2015ApJ...801..143M. doi:10.1088/0004-637X/801/2/143. S2CID 55170390.Vizier catalog entry

[J-9] [a b] Gautier, Thomas N., III; et al. (September 2007), "Far-Infrared Properties of M Dwarfs", The Astrophysical Journal, 667 (1): 527–536, arXiv:0707.0464, Bibcode:2007ApJ...667..527G, doi:10.1086/520667, S2CID 15732144.

[K-10] Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604: A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715. S2CID 119216828.

[M-11] Boehle, A.; et al. (October 2019), "Combining high-contrast imaging and radial velocities to constrain the planetary architectures of nearby stars", Astronomy & Astrophysics, 630: 17, arXiv:1907.04334, Bibcode:2019A&A...630A..50B, doi:10.1051/0004-6361/201935733, A50.

[P-12] Byrne, P. B. (April 1981), "Gliese 825 - A new flare star", Monthly Notices of the Royal Astronomical Society, 195 (2): 143–147, Bibcode:1981MNRAS.195..143B, doi:10.1093/mnras/195.2.143.

[Q-13] Carson, J. C.; et al. (December 2011), "Low-mass evolution - Zero-age main sequence to asymptotic giant branch", The Astrophysical Journal, 743 (2): 141, arXiv:1110.2191, Bibcode:2011ApJ...743..141C, doi:10.1088/0004-637X/743/2/141, S2CID 119270911.

[A-14] -rara.ch. Johann Elert Bode. Uranographia star atlas (1801), Tabula XVI

[B-15] Johann Elert Bode. Allgemeine Beschreibung und Nachweisung der Gestirne (1801), Page 67

[N-16] Croswell, Ken (July 2003), "The Brightest Red Dwarf", Sky & Telescope: 32, hämtad 2011-02-18.

[O-17] Francis Baily. A Catalogue of 9766 Stars (1847), Page 219

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Observationsdata Epok: J2000.0
Lacaille 8760

Stjärnbild	Mikroskopet
Rektascension	21^t 17^m 15,269 ^s^[1]
Deklination	-38° 52′ 02,51 ″^[1]
Skenbar magnitud ( $V$ )	+6,67^[2]
Stjärntyp
Spektraltyp	M0 Ve^[3]^[4]
U–B	+1,165^[3]
B–V	+1,395^[3]
Variabeltyp	Flarestjärna^[5]
Astrometri
Radialhastighet ( $R_{v}$ )	+20,7^[4] km/s
Egenrörelse (µ)	RA: -3 258,553^[1] mas/år Dek.: -1 145,396^[1] mas/år
Parallax ( $\pi$ )	251,9124 ± 0,0352^[6]
Avstånd	12,947 ± 0,002 lå (3,9696 ± 0,0006 pc)
Absolut magnitud ( $M_{V}$ )	+8,69^[2]
Detaljer
Massa	0,60^[2] M_☉
Radie	0,51^[7] R_☉
Luminositet	0,072^[8] L_☉
Temperatur	3 800^[9] K
Metallicitet	-0,01 ± 0,04^[10]
Vinkelhastighet	3,3^[4] km/s
Ålder	4,8 ± 2,9^[11] miljarder år
Andra beteckningar
HD 202560, AC2000 3462277, CD-39 14192, CPD-39 8920, 2E 4461, GJ 825, HIC 105090, HIP 105090, IRAS 21141-3904, LHS 66, 2MASS J21171534-3852022, NLTT 50917, PLX 5117, PPM 301208, 1RXS J211717.8-385150, SAO 212866, TYC 7966-1201-1, uvby98 100202560, AX Microscopii, WISEA J211712.39-385214.4, [GKL99] 404, Gaia DR3 6583272171336048640, Gaia DR2 6583272171335359360^[5]^[3]

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