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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 170 153 Target list of AstraLux observations
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): References as follows:
16 = Roeser & Bastian (1988A&AS...74..449R 1988A&AS...74..449R, Cat. I/146)
17 = Simonson (1968ApJ...154..923S 1968ApJ...154..923S)
18 = Garrison (1970AJ.....75.1001G 1970AJ.....75.1001G)
19 = Contreras et al. (2002AJ....124.1585C 2002AJ....124.1585C)
20 = Morgan et al. (1955ApJS....2...41M 1955ApJS....2...41M)
21 = Blaauw et al. (1959ApJ...130...69B 1959ApJ...130...69B)
22 = Garrison & Kormendy (1976PASP...88..865G 1976PASP...88..865G)
23 = Walborn (1971ApJS...23..257W 1971ApJS...23..257W)
24 = Jaschek et al. (1964PLPla..28....1J 1964PLPla..28....1J, Cat. III/18)
25 = Sicilia-Aguilar et al. (2005AJ....130..188S 2005AJ....130..188S, Cat. J/AJ/130/188)
26 = Hiltner & Johnson (1956ApJ...124..367H 1956ApJ...124..367H)
27 = Melikian et al. (1988IBVS.3187....1M 1988IBVS.3187....1M)
28 = Skiff (2007, Cat. II/277)
29 = Kharchenko (2001KFNT...17..409K 2001KFNT...17..409K, Cat. I/280)
30 = Garmany & Stencel (1992A&AS...94..211G 1992A&AS...94..211G)
31 = Morgan et al. (1953ApJ...118..318M 1953ApJ...118..318M)
32 = Mendoza V. (1958ApJ...128..207M 1958ApJ...128..207M)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Apr-2012