HD 191220

	HD 191220
Observationsdata; Epok: J2000.0
Stjärnbild	Oktanten
Rektascension	20t 24m 54,91771s
Deklination	-83° 18′ 38,2301 ″
Skenbar magnitud ()	6,14 ± 0,01
Stjärntyp
Spektraltyp	A2/3 mA8-F0
U–B	+0,13
B–V	+0,20
Astrometri
Radialhastighet ()	+0,1 ± 1,3 km/s
Egenrörelse (µ)	RA: +23,223 mas/år; Dek.: +6,228 mas/år
Parallax ()	13,331 ± 0,0247
Avstånd	244,7 ± 0,5 lå (75,0 ± 0,1 pc)
Absolut magnitud ()	+1,76
Detaljer
Massa	2,06 ± 0,40 M☉
Radie	2,17 ± 0,06 R☉
Luminositet	15,57 L☉
Temperatur	7 706 ± 126 K
Metallicitet	-0,02
Ålder	979 ± 166 miljoner år
Andra beteckningar
	45 G. Octantis, HD 191220, CD-83 253, CPD-83 695, GSC 09524-01767, HIC 100697, HIP 100697, HR 7698, IRAS 20144-8328, 2MASS J20245492-8318379, PPM 378451, RAVE J202454.9-831838, SAO 258856, TD1 26099, TYC 9524-1767-1, uvby98 100191220, Gaia DR2 6346617755337978240, Gaia DR3 6346617755337978240

HD 191220 eller HR 7698 är en ensam stjärna belägen i den mellersta delen av stjärnbilden Oktanten. Den har en skenbar magnitud av ca 6,14^[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 13,33 mas,^[1] beräknas den befinna sig på ett avstånd på ca 245 ljusår (75 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 0,1 km/s.^[5] Den skenbara ljusstyrkan hos HD 191220 är förminskad med 0,22 magnitud på grund av interstellärt stoft.^[15]

Egenskaper

HD 191220 är en vit till blå stjärna i huvudserien av spektralklass A2/3 mA8-F0,^[16] som är en kemiskt speciell Am-stjärna med metallinjer i dess spektrum av en stjärna av spektralklass A8-F0. Den har en massa som är ca 2,2^[7] solmassor, en radie som är ca 2,2^[8] solradier och utsänder energi från dess fotosfär motsvarande ca 15,6 gånger solen^[9] vid en effektiv temperatur av ca 7 700 K.^[10] Stjärnan har en metallicitet liknande solens.^[11]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 191220, 7 maj 2023..

Noter

^ [a b c d e f g] Gaia Collaboration; et al. (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674. 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.
^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
^ [a b] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
^ [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.
^ 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] 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.
^ [a b] Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
^ [a b] McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. eISSN 1365-2966. ISSN 0035-8711.
^ [a b] Bai, Yu; Liu, JiFeng; Bai, ZhongRui; Wang, Song; Fan, DongWei (2 August 2019). "Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release". The Astronomical Journal. 158 (2): 93. arXiv:1906.09695. Bibcode:2019AJ....158...93B. doi:10.3847/1538-3881/ab3048. eISSN 1538-3881.
^ [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.
^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
^ HR 7698 (unistra.fr). Hämtad 2023-09-15.
^ "HD 191220". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 21 november 2022.
^ 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.
^ Renson, P.; Manfroid, J. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788. eISSN 1432-0746. ISSN 0004-6361.

[A-1] [a b c d e f g] Gaia Collaboration; et al. (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[B-2] [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.

[C-3] Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.

[D-4] [a b] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[E-5] [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.

[F-6] 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.

[G-7] [a b] 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.

[H-8] [a b] Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.

[I-9] [a b] McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. eISSN 1365-2966. ISSN 0035-8711.

[K-10] [a b] Bai, Yu; Liu, JiFeng; Bai, ZhongRui; Wang, Song; Fan, DongWei (2 August 2019). "Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release". The Astronomical Journal. 158 (2): 93. arXiv:1906.09695. Bibcode:2019AJ....158...93B. doi:10.3847/1538-3881/ab3048. eISSN 1538-3881.

[L-11] [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.

[M-12] Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.

[SIMBAD-13] HR 7698 (unistra.fr). Hämtad 2023-09-15.

[N-14] "HD 191220". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 21 november 2022.

[O-15] 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.

[P-16] Renson, P.; Manfroid, J. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788. eISSN 1432-0746. ISSN 0004-6361.

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Observationsdata Epok: J2000.0
HD 191220

Stjärnbild	Oktanten
Rektascension	20^t 24^m 54,91771^s^[1]
Deklination	-83° 18′ 38,2301 ″^[1]
Skenbar magnitud ( $V$ )	6,14 ± 0,01^[2]
Stjärntyp
Spektraltyp	A2/3 mA8-F0^[3]
U–B	+0,13^[4]
B–V	+0,20^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	+0,1 ± 1,3^[5] km/s
Egenrörelse (µ)	RA: +23,223^[1] mas/år Dek.: +6,228^[1] mas/år
Parallax ( $\pi$ )	13,331 ± 0,0247^[1]
Avstånd	244,7 ± 0,5 lå (75,0 ± 0,1 pc)
Absolut magnitud ( $M_{V}$ )	+1,76^[6]
Detaljer
Massa	2,06 ± 0,40^[7] M_☉
Radie	2,17 ± 0,06^[8] R_☉
Luminositet	15,57^[9] L_☉
Temperatur	7 706 ± 126^[10] K
Metallicitet	-0,02^[11]
Ålder	979 ± 166^[1] miljoner år
Andra beteckningar
45 G. Octantis,^[12] HD 191220, CD-83 253, CPD-83 695, GSC 09524-01767, HIC 100697, HIP 100697, HR 7698, IRAS 20144-8328, 2MASS J20245492-8318379, PPM 378451, RAVE J202454.9-831838, SAO 258856, TD1 26099, TYC 9524-1767-1, uvby98 100191220, Gaia DR2 6346617755337978240, Gaia DR3 6346617755337978240^[13]^[14]