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J/A+A/538/A74       Massive binaries in Cepheus OB2/3 region     (Peter+, 2012)

Massive binaries in the Cepheus OB2/3 region. Constraining the formation mechanism of massive stars. Peter D., Feldt M., Henning T., Hormuth F. <Astron. Astrophys., 538, A74 (2012)> =2012A&A...538A..74P
ADC_Keywords: Clusters, open ; Stars, double and multiple ; Spectral types Keywords: binaries: close - stars: formation - stars: massive Abstract: Two different formation scenarios for stars of masses larger than 10M exist. Although simulations within both scenarios are capable of producing stars up to the highest observed masses, the relevance of the two formation scenarios for massive star-formation is not yet clear. We aim to detect companions to massive stars to constrain the binary parameters of the multiple systems. These findings will help to constrain the formation of massive stars. Description: We performed z'-band observations of massive and intermediate-mass stars in the Cep OB2/3 associations with the Lucky imaging camera AstraLux on the 2.2m telescope of the Calar Alto observatory. The analysis aimed at detecting binary systems with separations out to 2.2' (∼1700AU), the inner limit depending on the contrast. The maximum contrast of 7mag in z' (corresponding to a mass contrast of 17:1 versus an O9V primary) requires a minimum separation of 0.7' (∼550AU). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 170 153 Target list of AstraLux observations
See also: I/146 : Positions and Proper Motions - North (Roeser+, 1988) III/18 : Stellar Spectra Class. in Morgan-Keenan System (Jaschek+ 1964) II/277 : UBVRI photometry of faint field stars (Skiff, 2007) J/A+AS/94/519 : uvby-beta Photometry of Cep OB3 (Jordi+ 1992) J/ApJ/638/897 : IR photometry in Trumpler 37 & NGC 7160 (Sicilia-Aguilar+ 2006) J/ApJ/710/597 : Accretion in disks in Cep OB2 (Sicilia-Aguilar+, 2010) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 24 A24 --- Name Star name 26- 27 I2 h RAh Right ascension (J2000) 29- 30 I2 min RAm Right ascension (J2000) 32- 35 F4.1 s RAs Right ascension (J2000) 37 A1 --- DE- Declination sign (J2000) 38- 39 I2 deg DEd Declination (J2000) 41- 42 I2 arcmin DEm Declination (J2000) 44- 45 I2 arcsec DEs Declination (J2000) 47- 56 A10 --- SpType MK spectral type 58- 61 F4.2 arcsec Sep ?=- Separation of the detected companions up to a maximum separation of 3". Any companion further out is not shown 62 A1 --- u_Sep [?] Uncertainty flag on Sep 64- 68 F5.1 deg PA ? Position angle 69 A1 --- u_PA [?] Uncertainty flag on PA 71- 74 F4.2 mag q ?=- Magnitude difference between primary and secondary 75 A1 --- u_q [?] Uncertainty flag on q 77- 78 A2 --- Mmb [y n pm] Membership of the target to the association: y=yes, n=no, pm=probable member, pn=probable non-member 79- 83 A5 --- r_Mmb Reference for Mmb (1) 85- 90 A6 --- SpType1 Other MK spectral type 92-103 A12 --- r_SpType1 Reference(s) for SpType1 (1) 105-111 A7 --- SpType2 Other MK spectral type 113-123 A11 --- r_SpType2 Reference(s) for SpType2 (1) 125-134 A10 --- SpType3 Other MK spectral type 136-143 A8 --- r_SpType3 Reference(s) for SpType3 (1) 145-152 A8 --- SpType4 Other MK spectral type 153-157 A5 --- r_SpType4 Reference(s) for SpType4 (1) 159-167 A9 --- SpType5 Other MK spectral type 169-170 A2 --- r_SpType5 Reference(s) for SpType5 (1)
Note (1): References as follows: 16 = Roeser & Bastian (1988A&AS...74..449R, Cat. I/146) 17 = Simonson (1968ApJ...154..923S) 18 = Garrison (1970AJ.....75.1001G) 19 = Contreras et al. (2002AJ....124.1585C) 20 = Morgan et al. (1955ApJS....2...41M) 21 = Blaauw et al. (1959ApJ...130...69B) 22 = Garrison & Kormendy (1976PASP...88..865G) 23 = Walborn (1971ApJS...23..257W) 24 = Jaschek et al. (1964PLPla..28....1J, Cat. III/18) 25 = Sicilia-Aguilar et al. (2005AJ....130..188S, Cat. J/AJ/130/188) 26 = Hiltner & Johnson (1956ApJ...124..367H) 27 = Melikian et al. (1988IBVS.3187....1M) 28 = Skiff (2007, Cat. II/277) 29 = Kharchenko (2001KFNT...17..409K, Cat. I/280) 30 = Garmany & Stencel (1992A&AS...94..211G) 31 = Morgan et al. (1953ApJ...118..318M) 32 = Mendoza V. (1958ApJ...128..207M)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Apr-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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