HD 170384

	HD 170384
Observationsdata; Epok: J2000.0
Stjärnbild	Södra kronan
Rektascension	18t 31m 02,94877s
Deklination	-41° 54′ 49,8025″
Skenbar magnitud ()	6,02 ± 0,01
Stjärntyp
Spektraltyp	A3 V
B–V	+0,14
Astrometri
Radialhastighet ()	-11,4 ± 0,4 km/s
Egenrörelse (µ)	RA: -3,406 mas/år; Dek.: -31,578 mas/år
Parallax ()	14,2387 ± 0,0341
Avstånd	229,1 ± 0,5 lå (70,2 ± 0,2 pc)
Absolut magnitud ()	+1,86
Detaljer
Massa	2,00 M☉
Radie	1,91 ± 0,10 R☉
Luminositet	16,7 +1,1−1,0 L☉
Temperatur	8 694 K
Metallicitet	-0,01
Vinkelhastighet	127 ± 5 km/s
Ålder	544 miljoner år
Andra beteckningar
	11 G Coronae Australis, HD 170384, CD-41 12871, CPD-41 8697, GSC 07910-02314, HIC 90759, HIP 90759, HR 6931, 2MASS J18310296-4154498, PPM 324175, SAO 229080, TD1 22513, TYC 7910-2314-1, uvby98 100170384, Gaia DR2 6722943305221879296, Gaia DR3 6722943305221879296

HD 170384 eller HR 6931, är en ensam stjärna belägen i mellersta delen av stjärnbilden Södra kronan. Den har en skenbar magnitud av ca 6,02^[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 14,24 mas^[1] beräknas den befinna sig på ett avstånd av ca 229 ljusår (ca 70 parsec) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet av ca -11 km/s.^[5] Stjärnan minskas på dess nuvarande avstånd i ljusstyrka genom skymning av interstellärt stoft med 0,28 magnitud^[16] och den har en absolut magnitud på +1,86.^[6]

Egenskaper

HD 170384 är en vit till blå stjärna i huvudserien^[9] av spektralklass A3 V.^[3] Den har en massa av ca 2^[7] solmassor, en radie av ca 1,9^[7] solradie och utsänder energi från dess fotosfär motsvarande ca 17^[9] gånger solen vid en effektiv temperatur av ca 8 700^[10] K. Den har en metallicitet på 97 procent av solens med (Fe/H) = -0,01.^[10] Liksom många heta stjärnor, roterar HD 170384 snabbt och har en projicerad rotationshastighet på 127 km/s och en uppskattad rotationsperiod på 19,2 timmar.^[12]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 170384, 14 maj 2023..

Noter

^ [a b c d e f] 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] Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
^ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode:1971MNSSA..30...37C. ISSN 0024-8266.
^ [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] David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.
^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
^ [a b c] 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 c] Balona, L. A. (October 7, 2019). "Evidence for spots on hot stars suggests major revision of stellar physics". Monthly Notices of the Royal Astronomical Society. 490 (2). Oxford University Press (OUP): 2112–2116. arXiv:1910.01584. doi:10.1093/mnras/stz2808. ISSN 0035-8711. S2CID 203642124.
^ 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.
^ [a b] Reiners, A.; Royer, F. (February 2004). "First signatures of strong differential rotation in A-type stars". Astronomy & Astrophysics. 415 (1): 325–329. arXiv:astro-ph/0311341. Bibcode:2004A&A...415..325R. doi:10.1051/0004-6361:20034175. eISSN 1432-0746. ISSN 0004-6361. S2CID 15726297.
^ 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.
^ https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HR+6931. Hämtad 2024-10-31.
^ "HD 170384". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 5 juni 2023.
^ 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.

Externa länkar

https://www.universeguide.com/star/90759/hd170384

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

[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. S2CID 17128864.

[D-3] [a b] Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.

[E-4] Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode:1971MNSSA..30...37C. ISSN 0024-8266.

[F-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.

[G-6] [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.

[H-7] [a b c d] David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.

[I-8] Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.

[C-9] [a b c] 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.

[K-10] [a b c] Balona, L. A. (October 7, 2019). "Evidence for spots on hot stars suggests major revision of stellar physics". Monthly Notices of the Royal Astronomical Society. 490 (2). Oxford University Press (OUP): 2112–2116. arXiv:1910.01584. doi:10.1093/mnras/stz2808. ISSN 0035-8711. S2CID 203642124.

[L-11] 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.

[M-12] [a b] Reiners, A.; Royer, F. (February 2004). "First signatures of strong differential rotation in A-type stars". Astronomy & Astrophysics. 415 (1): 325–329. arXiv:astro-ph/0311341. Bibcode:2004A&A...415..325R. doi:10.1051/0004-6361:20034175. eISSN 1432-0746. ISSN 0004-6361. S2CID 15726297.

[N-13] 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-14] ttps://simbad.cds.unistra.fr/simbad/sim-id?Ident=HR+6931. Hämtad 2024-10-31.

[O-15] "HD 170384". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 5 juni 2023.

[P-16] 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.

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Observationsdata Epok: J2000.0
HD 170384

Stjärnbild	Södra kronan
Rektascension	18^t 31^m 02,94877^s^[1]
Deklination	-41° 54′ 49,8025″^[1]
Skenbar magnitud ( $V$ )	6,02 ± 0,01^[2]
Stjärntyp
Spektraltyp	A3 V^[3]
B–V	+0,14^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	-11,4 ± 0,4^[5] km/s
Egenrörelse (µ)	RA: -3,406^[1] mas/år Dek.: -31,578^[1] mas/år
Parallax ( $\pi$ )	14,2387 ± 0,0341^[1]
Avstånd	229,1 ± 0,5 lå (70,2 ± 0,2 pc)
Absolut magnitud ( $M_{V}$ )	+1,86^[6]
Detaljer
Massa	2,00^[7] M_☉
Radie	1,91 ± 0,10^[8] R_☉
Luminositet	16,7 ^+1,1_−1,0^[9] L_☉
Temperatur	8 694^[10] K
Metallicitet	-0,01^[11]
Vinkelhastighet	127 ± 5^[12] km/s
Ålder	544^[7] miljoner år
Andra beteckningar
11 G Coronae Australis,^[13] HD 170384, CD-41 12871, CPD-41 8697, GSC 07910-02314, HIC 90759, HIP 90759, HR 6931, 2MASS J18310296-4154498, PPM 324175, SAO 229080, TD1 22513, TYC 7910-2314-1, uvby98 100170384, Gaia DR2 6722943305221879296, Gaia DR3 6722943305221879296^[14]^[15]