CPD−57°2874 - Misplaced Pages

Star in the constellation Carina

CPD−57°2874
Observation data Epoch J2000 Equinox J2000
Constellation	Carina
Right ascension	10 15 21.9711
Declination	−57° 51′ 42.713″
Apparent magnitude (V)	+10.08
Characteristics
Spectral type	sgB1
U−B color index	+0.30
B−V color index	+1.65
Variable type	suspected
Astrometry

Radial velocity (R_v)	−54 km/s
Proper motion (μ)	RA: −5.90 mas/yr Dec.: 5.10 mas/yr
Distance	3,440 pc
Absolute magnitude (M_V)	−7.7

Details

Mass	17.4–18.6 `M`_☉
Radius	60 `R`_☉
Luminosity	500,000 `L`_☉
Temperature	20,000 K
Rotational velocity (v sin i)	36 ± 4 km/s

Other designations
CD–57° 3107, CPD–57°2874, GSC 08608-00427, PPM 769178
Database references
SIMBAD	data

CPD−57°2874 is a B supergiant in the constellation Carina. It is a rare star as it is hot but has dust which shows forbidden lines and IR emissions. In 2007 the high spatial and spectral resolution of the star's circumstellar envelope was studied. This was the first time such a study was carried out on a class B supergiant.

Disc

CPD−57°2874 is surrounded by a disc of expelled stellar material. The inner edge of the disc is 27.5 AU from the star and it is inclined at an angle of 46° to us. The particular alignment, temperature, and density of the disc combine to produce the forbidden spectral lines. The detached ring leads to speculation that the inner regions are cleared by an unseen binary companion.

Variability

Photometry of CPD−57°2874 suggests that it is variable with an amplitude of perhaps 0.2 magnitude. It has not been formally classified as a variable star and the cause of the variations is unclear.

References

^ Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. (1998). "The TYCHO Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
^ Domiciano De Souza, A.; Driebe, T.; Chesneau, O.; Hofmann, K.-H.; Kraus, S.; Miroshnichenko, A. S.; Ohnaka, K.; Petrov, R. G.; Preisbisch, T.; Stee, P.; Weigelt, G.; Lisi, F.; Malbet, F.; Richichi, A. (2007). "AMBER/VLTI and MIDI/VLTI spectro-interferometric observations of the B supergiant CPD-57°2874. Size and geometry of the circumstellar envelope in the near- and mid-IR". Astronomy and Astrophysics. 464: 81. arXiv:astro-ph/0510735. Bibcode:2007A&A...464...81D. doi:10.1051/0004-6361:20054134. S2CID 7829778.
^ Domiciano De Souza, A.; Bendjoya, P.; Niccolini, G.; Chesneau, O.; Borges Fernandes, M.; Carciofi, A. C.; Spang, A.; Stee, P.; Driebe, T. (2011). "Fast ray-tracing algorithm for circumstellar structures (FRACS). II. Disc parameters of the B[e] supergiant CPD-57°2874 from VLTI/MIDI data". Astronomy and Astrophysics. 525: A22. arXiv:1009.3422. Bibcode:2011A&A...525A..22D. doi:10.1051/0004-6361/201015194. S2CID 119113357.
Drilling, J. S. (1991). "UBV photometry of OB+ stars in the southern Milky Way". Astrophysical Journal Supplement Series. 76: 1033. Bibcode:1991ApJS...76.1033D. doi:10.1086/191588.
^ Cidale, L. S.; et al. (2012). "Observational constraints for the circumstellar disk of the B[e] star CPD−52 9243". Astronomy and Astrophysics. 548 (A72): 2. Bibcode:2012A&A...548A..72C. doi:10.1051/0004-6361/201220120. hdl:11336/8289.
Kraus, M. (2009). "The pre- versus post-main sequence evolutionary phase of B stars. Constraints from 13CO band emission". Astronomy and Astrophysics. 494 (1): 253. arXiv:0901.0714. Bibcode:2009A&A...494..253K. doi:10.1051/0004-6361:200811020. S2CID 17577491.
Fernandes, M. Borges (2010). "The Nature Of Stars With The B Phenomenon Through Interferometric Eyes". Revista Mexicana de Astronomía y Astrofísica, Serie de Conferencias. 38: 98–99. Bibcode:2010RMxAC..38...98B.
F. Malbet; et al. (2007). "In The Intimacy Of Stars With Amber At The VLTI". SF2A: 2. Bibcode:2007sf2a.conf...13M.
International Astronomical Union. Symposium (2008). Massive Stars as Cosmic Engines (IAU S250). Cambridge University Press. p. 153. ISBN 9780521874724.

Constellation of Carina

Stars

Bayer	α (Canopus) β (Miaplacidus) ε (Avior) η θ ι (Aspidiske) υ χ ω
Variable	R S T (not variable) U Y RT AG BO CK EV GG HR IX OY PP (p) QZ V337 (q) V341 V343 (d) V344 (f) V345 (E) V357 (a) V371 (z) V372 V376 (b) V382 (x) V399 (P) V415 (A) V448 (O) V518 V520 (w) V528 V533 (y) V560 V602 V640 V742 V752 V759 V816 V817 V906
HR	2435 (N) 2934 (Q) 3159 (D) 3220 (B) 3260 (C) 3414 (e) 3415 (e) 3571 (c) 3598 (b) 3643 (G) 3663 (i) 3696 (g) 3728 (k) 3821 (H) 3825 (h) 3856 (m) 3884 (l) 4025 (M) 4089 (L) 4102 (I) 4114 (s) 4138 (K) 4142 4159 (r) 4164 (t) 4177 (t) 4205 4222 4257 (u) 4325 (z)
HD	53143 63765 (Tapecue) 65216 85628 93129 93250 93403 95086 97950
Other	AWI0005x3s CPD−57°2874 DEN 0817−6155 1E 1048-59 Innes' star LHS 288 NGC 3603-A1 NGC 3603-B NGC 3603-C OGLE-TR-182 OGLE-TR-211 OGLE2-TR-L9 Sher 25 WR 20a WR 21a WR 22 WR 24 WR 25 WR 30a WR 31a WR 42e

Exoplanets	OGLE-TR-111b OGLE-TR-132b OGLE-TR-113b OGLE-TR-182b OGLE-TR-211b OGLE2-TR-L9b HD 63765 b (Yvaga) HD 65216 b HD 65216 c HD 85628 Ab HD 95086 b (Levantes) Gliese 422 b

Star
clusters

NGC	2516 2808 3114 3293 3324 3532 3603
Other	Carina OB1 Carina OB2 Collinder 228 IC 2602 IC 2714 Platais 8 Trumpler 14 Trumpler 15 Trumpler 16 Westerlund 2

Nebulae

NGC	2867 3199 3576 3579 3581 3582 3584 3586
Other	Carina Nebula Finger of God Globule G290.1-0.8 Hen 2-47 Homunculus Nebula IC 2220 IC 2448 IGR J11014−6103 RCW 49

Galaxies

NGC	3059
Other	Carina Dwarf Spheroidal Galaxy

Galaxy clusters	Bullet Cluster

Astronomical events	GRB 000131 GRB 080916C

Disc

Variability

See also

References