HD 208741

	HD 208741
Observationsdata; Epok: J2000.0
Stjärnbild	Oktanten
Rektascension	22t 03m 03,8227s
Deklination	-76° 07′ 06,453 ″
Skenbar magnitud ()	5,93 ± 0,01
Stjärntyp
Spektraltyp	F3 III
U–B	+0,11
B–V	+0,39
Astrometri
Radialhastighet ()	+8 ± 1,1 km/s
Egenrörelse (µ)	RA: +24,821 mas/år; Dek.: -72,347 mas/år
Parallax ()	15,4736 ± 0,0383
Avstånd	210,8 ± 0,5 lå (64,6 ± 0,2 pc)
Absolut magnitud ()	+1,96
Detaljer
Massa	1,52 ± 0,25 M☉
Radie	2,6 ± 0,1 R☉
Luminositet	12,9 L☉
Temperatur	6 937 ± 80 K
Metallicitet	+0,33
Vinkelhastighet	36 km/s
Ålder	1,1 ± 0,1 miljarder år
Andra beteckningar
	66 G. Octantis, HD 208741, AKARI-IRC-V1, J2203037-760707, CCDM J22031-7607A, CPD-76 1542, FK5 3760, GSC 09475-02323, HIC 108849, HIP 108849, HR 8380, IRAS 21582-7621, 2MASS J22030381-7607066, PPM 375229, SAO 257993, TD1 28634, TYC 9475-2323-1, uvby98 100208741, WDS J22031-7607A, Gaia DR2 6358005362906955264, Gaia DR3 6358005362906955264 HD 208741 B: CD-76 1113, CCDM J22031-7607B, GSC 09475-02326, 2MASS J22031290-7606551, PPM 788139, RAVE J220312.9-760655, TYC 9475-2326-1, WDS J22031-7607B, Gaia DR2 6358005392971303168, Gaia DR3 6358005397267362048

HD 208741 eller HR 8380 är en dubbelstjärna belägen i den norra delen av stjärnbilden Oktanten. Den har en skenbar magnitud av ca 5,91^[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 15,47 mas,^[1] beräknas den befinna sig på ett avstånd på ca 211 ljusår (65 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 8 km/s.^[6]

Egenskaper[redigera | redigera wikitext]

Primärstjärnan HD 208741 A är en gul till vit jättestjärna av spektralklass F3 III,^[3]^[4] som avverkat 81,3 procent av dess tid i huvudserien^[15] Den har en massa som är lika med ca 1,5^[8] solmassa, en radie som är ca 2,6^[8] solradier och utsänder energi från dess fotosfär motsvarande ca 13 gånger solen^[9] vid en effektiv temperatur av ca 6 900 K.^[10]

Stjärnan har en följeslagare med skenbar magnitud av ca 10,57^[16] betecknad HD 208741 B och av spektralklass K5,^[17] som är separerad med 34,8 bågsekunder.^[16] Tillsammans bildar de en dubbelstjärna med beteckningen CPD−76°1542.^[16] Parets upptäckare, Sir John Herschel, noterade att primärstjärnan är en trolig spektroskopisk dubbelstjärna.^[18]

Referenser[redigera | redigera wikitext]

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 104555, 6 juni 2023.

Noter[redigera | redigera wikitext]

^ [a b c d e f] 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] 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.
^ [a b] de Vaucouleurs, A. (1 August 1957). "Spectral Types and Luminosities of B, A and F Southern Stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449–462. Bibcode:1957MNRAS.117..449D. doi:10.1093/mnras/117.4.449. eISSN 1365-2966. ISSN 0035-8711.
^ [a b] Malaroda, S. (August 1975). "Study of the F-type 1 MK spectral types". The Astronomical Journal. 80: 637. Bibcode:1975AJ.....80..637M. doi:10.1086/111786. ISSN 0004-6256.
^ [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 c d] 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.
^ [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 c] Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. eISSN 1432-0746. ISSN 0004-6361.
^ Erspamer, D.; North, P. (28 January 2003). "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs". Astronomy & Astrophysics. 398 (3): 1121–1135. arXiv:astro-ph/0210065. Bibcode:2003A&A...398.1121E. doi:10.1051/0004-6361:20021711. eISSN 1432-0746. ISSN 0004-6361.
^ Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (16 April 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. eISSN 1432-0746. ISSN 0004-6361.
^ HR 8380 (unistra.fr). Hämtad 2023-09-18.
^ CD-76 1113 (unistra.fr). Hämtad 2023-09-18.
^ 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 c] Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
^ Stoy, R. H. (1966). "Cape photographic catalogue for 1950.0; Meridian positions of standard stars, zone −64° to −80°". Annals of the Cape Observatory. 21: 0. Bibcode:1966AnCap..21....0S.
^ Herschel, J. F. W. (1835). "A Second Series of Micrometrical Measures of Double Stars chiefly performed with the 7-feet Equatorial, at Slough, in the years 1831, 1832, and 1833". Memoirs of the Royal Astronomical Society. 8: 37. Bibcode:1835MmRAS...8...37H.

Externa länkar[redigera | redigera wikitext]

https://www.universeguide.com/star/108849/hd208741.

[A-1] [a b c d e f] 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.

[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.

[F-3] [a b] de Vaucouleurs, A. (1 August 1957). "Spectral Types and Luminosities of B, A and F Southern Stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449–462. Bibcode:1957MNRAS.117..449D. doi:10.1093/mnras/117.4.449. eISSN 1365-2966. ISSN 0035-8711.

[G-4] [a b] Malaroda, S. (August 1975). "Study of the F-type 1 MK spectral types". The Astronomical Journal. 80: 637. Bibcode:1975AJ.....80..637M. doi:10.1086/111786. ISSN 0004-6256.

[H-5] [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.

[J-6] [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.

[K-7] 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.

[L-8] [a b c d] 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.

[M-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.

[N-10] [a b c] Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. eISSN 1432-0746. ISSN 0004-6361.

[O-11] Erspamer, D.; North, P. (28 January 2003). "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs". Astronomy & Astrophysics. 398 (3): 1121–1135. arXiv:astro-ph/0210065. Bibcode:2003A&A...398.1121E. doi:10.1051/0004-6361:20021711. eISSN 1432-0746. ISSN 0004-6361.

[P-12] Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (16 April 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. eISSN 1432-0746. ISSN 0004-6361.

[SIMBAD_A-13] HR 8380 (unistra.fr). Hämtad 2023-09-18.

[SIMBAD_B-14] CD-76 1113 (unistra.fr). Hämtad 2023-09-18.

[E-15] 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.

[D-16] [a b c] Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.

[I-17] Stoy, R. H. (1966). "Cape photographic catalogue for 1950.0; Meridian positions of standard stars, zone −64° to −80°". Annals of the Cape Observatory. 21: 0. Bibcode:1966AnCap..21....0S.

[Q-18] Herschel, J. F. W. (1835). "A Second Series of Micrometrical Measures of Double Stars chiefly performed with the 7-feet Equatorial, at Slough, in the years 1831, 1832, and 1833". Memoirs of the Royal Astronomical Society. 8: 37. Bibcode:1835MmRAS...8...37H.

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Observationsdata Epok: J2000.0
HD 208741

Stjärnbild	Oktanten
Rektascension	22^t 03^m 03,8227^s^[1]
Deklination	-76° 07′ 06,453 ″^[1]
Skenbar magnitud ( $V$ )	5,93 ± 0,01^[2]
Stjärntyp
Spektraltyp	F3 III^[3]^[4]
U–B	+0,11^[5]
B–V	+0,39^[5]
Astrometri
Radialhastighet ( $R_{v}$ )	+8 ± 1,1^[6] km/s
Egenrörelse (µ)	RA: +24,821^[1] mas/år Dek.: -72,347^[1] mas/år
Parallax ( $\pi$ )	15,4736 ± 0,0383^[1]
Avstånd	210,8 ± 0,5 lå (64,6 ± 0,2 pc)
Absolut magnitud ( $M_{V}$ )	+1,96^[7]
Detaljer
Massa	1,52 ± 0,25^[8] M_☉
Radie	2,6 ± 0,1^[8] R_☉
Luminositet	12,9^[9] L_☉
Temperatur	6 937 ± 80^[10] K
Metallicitet	+0,33^[10]
Vinkelhastighet	36^[11] km/s
Ålder	1,1 ± 0,1^[12] miljarder år
Andra beteckningar
66 G. Octantis, HD 208741, AKARI-IRC-V1, J2203037-760707, CCDM J22031-7607A, CPD-76 1542, FK5 3760, GSC 09475-02323, HIC 108849, HIP 108849, HR 8380, IRAS 21582-7621, 2MASS J22030381-7607066, PPM 375229, SAO 257993, TD1 28634, TYC 9475-2323-1, uvby98 100208741, WDS J22031-7607A, Gaia DR2 6358005362906955264, Gaia DR3 6358005362906955264^[13] HD 208741 B: CD-76 1113, CCDM J22031-7607B, GSC 09475-02326, 2MASS J22031290-7606551, PPM 788139, RAVE J220312.9-760655, TYC 9475-2326-1, WDS J22031-7607B, Gaia DR2 6358005392971303168, Gaia DR3 6358005397267362048^[14]