DX Cancri

	DX Cancri
Observationsdata; Epok: J2000.0
Stjärnbild	Kräftan
Rektascension	08t 29m 49,345 s
Deklination	+26° 46′ 33,74 ″
Skenbar magnitud ()	+14,81
Stjärntyp
Spektraltyp	M6.5 V
U–B	+2,11
B–V	+2,08
Variabeltyp	Flarestjärna
Astrometri
Radialhastighet ()	+9,0 km/s
Egenrörelse (µ)	RA: -1 140 mas/år; Dek.: -602 mas/år
Parallax ()	279,2496 ± 0,0637
Avstånd	11,680 ± 0,003 lå (3,5810 ± 0,0008 pc)
Absolut magnitud ()	+16,98
Detaljer
Massa	0,09 M☉
Radie	0,11 R☉
Luminositet	0,00065 L☉
Temperatur	2 840 K
Vinkelhastighet	11,0 km/s
Ålder	200 miljoner år
Andra beteckningar
	UCAC2 41191231, AP J08294949+2646348, G 51-15, GJ 1111, LHS 248, LSPM J0829+2646, 2MASS J08294949+2646348, NLTT 19635, UCAC4 584-042341, USNO-B1.0 1167-00167383, DX Cancri, [GKL99] 181, Gaia DR3 703790044252850688, Gaia DR2 703790044252850688

DX Cancri är en ensam stjärna i mellersta delen av stjärnbilden Kräftan. Den har en skenbar magnitud av ca 14,81^[2] och kräver minst ett 16-tums teleskop^[14] för att kunna observeras. Baserat på parallax enligt Gaia Data Release 3 på ca 279,2 mas,^[6] beräknas den befinna sig på ett avstånd på ca 11,7 ljusår (ca 3,6 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 9 km/s.^[5] Stjärnan antas ingå i rörelsegruppen Castor av stjärnor med gemensam egenrörelse genom rymden. Gruppen uppskattas ha en ålder av 200 miljoner år.^[15]

Egenskaper[redigera | redigera wikitext]

DX Cancri är en röd dvärgstjärna i huvudserien av spektralklass M6.5 V.^[3] Den har en massa som är ca 0,09^[7] solmassa, en radie som är ca 0,11^[8] solradie och har ca 0,00065 gånger solens utstrålning av energi^[9] från dess fotosfär vid en effektiv temperatur av ca 2 800 K.^[10]

Ljuskurva i ultravioletta bandet för DX Cancri, plottad från Pettersen (1981).^[16]

DX Cancri är en flarestjärna med slumpvisa ökningar i ljusstyrka med upp till en faktor fem.^[1]

Referenser[redigera | redigera wikitext]

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, DX Cancri, 8 november 2022.

Noter[redigera | redigera wikitext]

^ [a b c d e] Zacharias, N.; et al. (2003). "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". VizieR Online Data Catalog. CDS/ADC Collection of Electronic Catalogues, 1289, 0 (2003). Bibcode:2003yCat.1289....0Z. Hämtad 2010-06-29.
^ [a b c d] "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Hämtad 2010-06-29.
^ [a b] Luhman, Kevin L.; Allers, Katelyn N.; Jaffe, Daniel T.; Cushing, Michael C.; Williams, Kurtis A.; Slesnick, Catherine L.; Vacca, William D. (April 2007), "Ophiuchus 1622-2405: Not a Planetary-Mass Binary", The Astrophysical Journal, 659 (2): 1629–1636, arXiv:astro-ph/0701242, Bibcode:2007ApJ...659.1629L, doi:10.1086/512539, S2CID 11153196
^ [a b] Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal. 86: 1220–1227. Bibcode:1981AJ.....86.1220W. doi:10.1086/113001.
^ [a b] Montes, D.; et al. (November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society. 328 (1): 45–63. arXiv:astro-ph/0106537. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x. S2CID 55727428.
^ [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 c] "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. Hämtad 2010-06-29.
^ [a b] Morin, J.; et al. (October 2010), "Large-scale magnetic topologies of late M dwarfs", Monthly Notices of the Royal Astronomical Society, 407 (4): 2269–2286, arXiv:1005.5552, Bibcode:2010MNRAS.407.2269M, doi:10.1111/j.1365-2966.2010.17101.x, S2CID 119192200
^ [a b] Vidotto, A. A.; et al. (July 2013). "Effects of M dwarf magnetic fields on potentially habitable planets". Astronomy & Astrophysics. 557: A67. arXiv:1306.4789. Bibcode:2013A&A...557A..67V. doi:10.1051/0004-6361/201321504. S2CID 44335981.
^ [a b] Reiners, Ansgar; Basri, Gibor (February 2007). "The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars". The Astrophysical Journal. 656 (2): 1121–1135. arXiv:astro-ph/0610365. Bibcode:2007ApJ...656.1121R. doi:10.1086/510304. S2CID 17743657.
^ Jenkins, J. S.; et al. (October 2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2): 975–988. arXiv:0908.4092. Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975. S2CID 119203469.
^ Lestrade, J.-F.; et al. (November 2009), "Search for cold debris disks around M-dwarfs. II", Astronomy and Astrophysics, 506 (3): 1455–1467, arXiv:0907.4782, Bibcode:2009A&A...506.1455L, doi:10.1051/0004-6361/200912306, S2CID 17035185
^ V* DX Cnc (unistra.fr). Hämtad 2023-02-21.
^ Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications, p. 9, ISBN 0486428206
^ Lestrade, J.-F.; et al. (December 2006), "Search for cold debris disks around M-dwarfs", Astronomy and Astrophysics, 460 (3): 733–741, arXiv:astro-ph/0609574, Bibcode:2006A&A...460..733L, doi:10.1051/0004-6361:20065873, S2CID 119328045
^ Pettersen, B. R. (February 1981). "Discovery of flare activity on the very low luminosity red dwarf G 51-15". Astronomy & Astrophysics. 95: 135–137. Hämtad 11 november 2021.

Vidare läsning[redigera | redigera wikitext]

Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). ”Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs”. The Astrophysical Journal 784 (2): sid. 156. doi:10.1088/0004-637X/784/2/156. Bibcode: 2014ApJ...784..156D. Table with parallaxes.

Externa länkar[redigera | redigera wikitext]

[B-1] [a b c d e] Zacharias, N.; et al. (2003). "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". VizieR Online Data Catalog. CDS/ADC Collection of Electronic Catalogues, 1289, 0 (2003). Bibcode:2003yCat.1289....0Z. Hämtad 2010-06-29.

[C-2] [a b c d] "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Hämtad 2010-06-29.

[D-3] [a b] Luhman, Kevin L.; Allers, Katelyn N.; Jaffe, Daniel T.; Cushing, Michael C.; Williams, Kurtis A.; Slesnick, Catherine L.; Vacca, William D. (April 2007), "Ophiuchus 1622-2405: Not a Planetary-Mass Binary", The Astrophysical Journal, 659 (2): 1629–1636, arXiv:astro-ph/0701242, Bibcode:2007ApJ...659.1629L, doi:10.1086/512539, S2CID 11153196

[E-4] [a b] Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal. 86: 1220–1227. Bibcode:1981AJ.....86.1220W. doi:10.1086/113001.

[F-5] [a b] Montes, D.; et al. (November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society. 328 (1): 45–63. arXiv:astro-ph/0106537. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x. S2CID 55727428.

[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 c] "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. Hämtad 2010-06-29.

[I-8] [a b] Morin, J.; et al. (October 2010), "Large-scale magnetic topologies of late M dwarfs", Monthly Notices of the Royal Astronomical Society, 407 (4): 2269–2286, arXiv:1005.5552, Bibcode:2010MNRAS.407.2269M, doi:10.1111/j.1365-2966.2010.17101.x, S2CID 119192200

[J-9] [a b] Vidotto, A. A.; et al. (July 2013). "Effects of M dwarf magnetic fields on potentially habitable planets". Astronomy & Astrophysics. 557: A67. arXiv:1306.4789. Bibcode:2013A&A...557A..67V. doi:10.1051/0004-6361/201321504. S2CID 44335981.

[K-10] [a b] Reiners, Ansgar; Basri, Gibor (February 2007). "The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars". The Astrophysical Journal. 656 (2): 1121–1135. arXiv:astro-ph/0610365. Bibcode:2007ApJ...656.1121R. doi:10.1086/510304. S2CID 17743657.

[L-11] Jenkins, J. S.; et al. (October 2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2): 975–988. arXiv:0908.4092. Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975. S2CID 119203469.

[M-12] Lestrade, J.-F.; et al. (November 2009), "Search for cold debris disks around M-dwarfs. II", Astronomy and Astrophysics, 506 (3): 1455–1467, arXiv:0907.4782, Bibcode:2009A&A...506.1455L, doi:10.1051/0004-6361/200912306, S2CID 17035185

[SIMBAD-13] V* DX Cnc (unistra.fr). Hämtad 2023-02-21.

[N-14] Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications, p. 9, ISBN 0486428206

[O-15] Lestrade, J.-F.; et al. (December 2006), "Search for cold debris disks around M-dwarfs", Astronomy and Astrophysics, 460 (3): 733–741, arXiv:astro-ph/0609574, Bibcode:2006A&A...460..733L, doi:10.1051/0004-6361:20065873, S2CID 119328045

[A-16] Pettersen, B. R. (February 1981). "Discovery of flare activity on the very low luminosity red dwarf G 51-15". Astronomy & Astrophysics. 95: 135–137. Hämtad 11 november 2021.

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Observationsdata Epok: J2000.0
DX Cancri

Stjärnbild	Kräftan
Rektascension	08^t 29^m 49,345 ^s^[1]
Deklination	+26° 46′ 33,74 ″^[1]
Skenbar magnitud ( $V$ )	+14,81^[2]
Stjärntyp
Spektraltyp	M6.5 V^[3]
U–B	+2,11^[4]
B–V	+2,08^[4]
Variabeltyp	Flarestjärna^[2]
Astrometri
Radialhastighet ( $R_{v}$ )	+9,0^[5] km/s
Egenrörelse (µ)	RA: -1 140^[1] mas/år Dek.: -602^[1] mas/år
Parallax ( $\pi$ )	279,2496 ± 0,0637^[6]
Avstånd	11,680 ± 0,003 lå (3,5810 ± 0,0008 pc)
Absolut magnitud ( $M_{V}$ )	+16,98^[7]
Detaljer
Massa	0,09^[7] M_☉
Radie	0,11^[8] R_☉
Luminositet	0,00065^[9] L_☉
Temperatur	2 840^[10] K
Vinkelhastighet	11,0^[11] km/s
Ålder	200^[12] miljoner år
Andra beteckningar
UCAC2 41191231, AP J08294949+2646348, G 51-15, GJ 1111, LHS 248, LSPM J0829+2646, 2MASS J08294949+2646348, NLTT 19635, UCAC4 584-042341, USNO-B1.0 1167-00167383, DX Cancri, [GKL99] 181, Gaia DR3 703790044252850688, Gaia DR2 703790044252850688^[13]^[2]