AX Circini

	AX Circini
Observationsdata; Epok: J2000.0
Stjärnbild	Cirkelpassaren
Rektascension	14t 52m 35,25234s
Deklination	-63° 48′ 35,4172″
Skenbar magnitud ()	+5,91 (5,69 - 6,19)
Stjärntyp
Spektraltyp	F8 II + B6 V
U–B	+0,2
B–V	+0,8
Variabeltyp	Delta Cep
Astrometri
Radialhastighet ()	-20,9 ± 4,6 km/s
Egenrörelse (µ)	RA: -4,779 mas/år; Dek.: -5,108 mas/år
Parallax ()	1,7449 ± 0,3450
Avstånd	ca 1 900 lå (ca 600 pc)
Absolut magnitud ()	-3,37
Detaljer
Massa	11,56 M☉
Radie	45,68 R☉
Luminositet	2 050 L☉
Temperatur	5 443 ± 21 K
Metallicitet	-0,05 (Fe/H) dex
Vinkelhastighet	7,4 ± 0,4 km/s
Andra beteckningar
	26 Circini, CD-63 1029, CPD-63 3436, GSC 09028-01324, HD 130701, HD 130702, HIC 72773, HIP 72773, HR 5527, IRAS 14485-6336, 2MASS J14523526-6348357, PPM 361050, SAO 252928, TYC 9028-1324-1, uvby98 100130701, V* AX Cir, WDS J14526-6349AB, Gaia EDR3 5873984023533350400, Gaia DR2 5873984023533350400

AX Circini är en dubbelstjärna^[4] i den mellersta delen av stjärnbilden Cirkelpassaren. Den har en genomsnittlig skenbar magnitud av ca 5,91^[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 1,75 mas,^[6] beräknas den befinna sig på ett avstånd på ca 1 900 ljusår (ca 600 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -21 km/s.^[7]

Egenskaper

Primärstjärnan AX Circini A är en gul till vit ljusstark jättestjärna av spektralklass F8 II.^[3]^[16] och är en klassisk Delta Cephei-variabel.^[11] Den har en massa som är ca 12^[9] solmassor, en radie som är ca 46^[1] solradier och har ca 2 000 gånger solens utstrålning av energi^[10] från dess fotosfär vid en effektiv temperatur av ca 5 400 K.^[11]

AX Circini är en spektroskopisk dubbelstjärna med en omloppsperiod på 17,88 år och en excentricitet på 0,19.^[9] Följeslagaren AX Circini B är en stjärna i huvudserien av spektralklass B6 V och en absolut magnitud på cirka -0,12.^[11] Den bekräftades 1982 och utlöstes med lång baslinjeinterferometri 2014^[4] och 2015.^[17] Konstellationen har ett a sin i-värde på 6,05 AE, där a är halva storaxeln och i är den (okända) lutningen hos omloppsbanan.^[4]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, AX Circini, 27 mars 2022.

Noter

^ [a b c d e f g] 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] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
^ [a b] Klagyivik, P.; Szabados, L. (September 2009). "Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes". Astronomy and Astrophysics. 504 (3): 959–972. arXiv:0908.3561. Bibcode:2009A&A...504..959K. doi:10.1051/0004-6361/200811464. S2CID 18283579.
^ [a b c d] Gallenne, A.; et al. (January 2014), "Multiplicity of Galactic Cepheids from long-baseline interferometry. II. The Companion of AX Circini revealed with VLTI/PIONIER", Astronomy & Astrophysics, 561: 5, arXiv:1312.1950, Bibcode:2014A&A...561L...3G, doi:10.1051/0004-6361/201322883, S2CID 14282671, L3
^ [a b] Lloyd Evans, T (1968). "The frequency of Cepheid binaries". Monthly Notices of the Royal Astronomical Society. 141: 109–142. Bibcode:1968MNRAS.141..109L. doi:10.1093/mnras/141.1.109.
^ [a b] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
^ [a b] de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ Evans, Nancy Evans; Bond, Howard E; Schaefer, Gail H; Mason, Brian D; Karovska, Margarita; Tingle, Evan (2013). "Binary Cepheids: Separations and Mass Ratios in 5 M ☉ Binaries". The Astronomical Journal. 146 (4): 93. arXiv:1307.7123. Bibcode:2013AJ....146...93E. doi:10.1088/0004-6256/146/4/93. S2CID 34133110.
^ [a b c] Tokovinin, A. (2008). "Comparative statistics and origin of triple and quadruple stars". Monthly Notices of the Royal Astronomical Society. 389 (2): 925–938. arXiv:0806.3263. Bibcode:2008MNRAS.389..925T. doi:10.1111/j.1365-2966.2008.13613.x. S2CID 16452670.
^ [a b] Petterson, O. K. L.; et al. (May 2004). Kurtz, Donald W.; Pollard, Karen R. (eds.). A spectroscopic study of southern binary Cepheids. Variable Stars in the Local Group, IAU Colloquium 193, Proceedings of the conference held 6-11 July, 2003 at Christchurch, New Zealand. ASP Conference Proceedings. Vol. 310. San Francisco: Astronomical Society of the Pacific. p. 403. Bibcode:2004ASPC..310..403P.
^ [a b c d] Usenko, I. A.; et al. (July 2011). "Spectroscopic studies of Cepheids (S Cru, AP Pup, AX Cir, S TrA, T Cru, R Mus, S Mus, U Car) and semiregular bright supergiants (V382 Car, HD 75276, R Pup) in the southern hemisphere". Astronomy Letters. 37 (7): 499–507. Bibcode:2011AstL...37..499U. doi:10.1134/S1063773711070061. S2CID 122968535.
^ Luck, R. E.; et al. (August 2011). "The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids". The Astronomical Journal. 142 (2): 12. arXiv:1106.0182. Bibcode:2011AJ....142...51L. doi:10.1088/0004-6256/142/2/51. S2CID 119288363. 51.
^ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
^ 26 Cir (unistra.fr). Hämtad 2022-07-25.
^ "26 Cir". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 28 augusti 2018.
^ Gallenne, A; Mérand, A; Kervella, P; Breitfelder, J; Le Bouquin, J.-B; Monnier, J. D; Gieren, W; Pilecki, B; Pietrzyński, G (2013). "Multiplicity of Galactic Cepheids from long-baseline interferometry". Astronomy & Astrophysics. 561: L3. arXiv:1312.1950. Bibcode:2014A&A...561L...3G. doi:10.1051/0004-6361/201322883. S2CID 14282671.
^ Gallenne, A.; et al. (July 2015). "Robust high-contrast companion detection from interferometric observations. The CANDID algorithm and an application to six binary Cepheids". Astronomy & Astrophysics. 579: 12. arXiv:1505.02715. Bibcode:2015A&A...579A..68G. doi:10.1051/0004-6361/201525917. S2CID 1118066. A68.

Externa länkar

https://www.universeguide.com/star/72773/axcircini.

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

[B-2] [a b] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.

[C-3] [a b] Klagyivik, P.; Szabados, L. (September 2009). "Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes". Astronomy and Astrophysics. 504 (3): 959–972. arXiv:0908.3561. Bibcode:2009A&A...504..959K. doi:10.1051/0004-6361/200811464. S2CID 18283579.

[D-4] [a b c d] Gallenne, A.; et al. (January 2014), "Multiplicity of Galactic Cepheids from long-baseline interferometry. II. The Companion of AX Circini revealed with VLTI/PIONIER", Astronomy & Astrophysics, 561: 5, arXiv:1312.1950, Bibcode:2014A&A...561L...3G, doi:10.1051/0004-6361/201322883, S2CID 14282671, L3

[E-5] [a b] Lloyd Evans, T (1968). "The frequency of Cepheid binaries". Monthly Notices of the Royal Astronomical Society. 141: 109–142. Bibcode:1968MNRAS.141..109L. doi:10.1093/mnras/141.1.109.

[F-6] [a b] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.

[G-7] [a b] de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.

[H-8] Evans, Nancy Evans; Bond, Howard E; Schaefer, Gail H; Mason, Brian D; Karovska, Margarita; Tingle, Evan (2013). "Binary Cepheids: Separations and Mass Ratios in 5 M ☉ Binaries". The Astronomical Journal. 146 (4): 93. arXiv:1307.7123. Bibcode:2013AJ....146...93E. doi:10.1088/0004-6256/146/4/93. S2CID 34133110.

[J-9] [a b c] Tokovinin, A. (2008). "Comparative statistics and origin of triple and quadruple stars". Monthly Notices of the Royal Astronomical Society. 389 (2): 925–938. arXiv:0806.3263. Bibcode:2008MNRAS.389..925T. doi:10.1111/j.1365-2966.2008.13613.x. S2CID 16452670.

[I-10] [a b] Petterson, O. K. L.; et al. (May 2004). Kurtz, Donald W.; Pollard, Karen R. (eds.). A spectroscopic study of southern binary Cepheids. Variable Stars in the Local Group, IAU Colloquium 193, Proceedings of the conference held 6-11 July, 2003 at Christchurch, New Zealand. ASP Conference Proceedings. Vol. 310. San Francisco: Astronomical Society of the Pacific. p. 403. Bibcode:2004ASPC..310..403P.

[K-11] [a b c d] Usenko, I. A.; et al. (July 2011). "Spectroscopic studies of Cepheids (S Cru, AP Pup, AX Cir, S TrA, T Cru, R Mus, S Mus, U Car) and semiregular bright supergiants (V382 Car, HD 75276, R Pup) in the southern hemisphere". Astronomy Letters. 37 (7): 499–507. Bibcode:2011AstL...37..499U. doi:10.1134/S1063773711070061. S2CID 122968535.

[L-12] Luck, R. E.; et al. (August 2011). "The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids". The Astronomical Journal. 142 (2): 12. arXiv:1106.0182. Bibcode:2011AJ....142...51L. doi:10.1088/0004-6256/142/2/51. S2CID 119288363. 51.

[M-13] Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.

[SIMBAD-14] 26 Cir (unistra.fr). Hämtad 2022-07-25.

[N-15] "26 Cir". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 28 augusti 2018.

[P-16] Gallenne, A; Mérand, A; Kervella, P; Breitfelder, J; Le Bouquin, J.-B; Monnier, J. D; Gieren, W; Pilecki, B; Pietrzyński, G (2013). "Multiplicity of Galactic Cepheids from long-baseline interferometry". Astronomy & Astrophysics. 561: L3. arXiv:1312.1950. Bibcode:2014A&A...561L...3G. doi:10.1051/0004-6361/201322883. S2CID 14282671.

[O-17] Gallenne, A.; et al. (July 2015). "Robust high-contrast companion detection from interferometric observations. The CANDID algorithm and an application to six binary Cepheids". Astronomy & Astrophysics. 579: 12. arXiv:1505.02715. Bibcode:2015A&A...579A..68G. doi:10.1051/0004-6361/201525917. S2CID 1118066. A68.

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AX Circini

Egenskaper

Referenser

Noter

Externa länkar

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