J/A+A/518/A1 Galactic massive stars with AstraLux (Maiz Apellaniz, 2010)
High-resolution imaging of Galactic massive stars with AstraLux:
I. 138 fields with delta > -25 degrees.
Maiz Apellaniz J.
<Astron. Astrophys. 518, A1 (2010)>
=2010A&A...518A...1M 2010A&A...518A...1M
ADC_Keywords: Stars, double and multiple ; Stars, O ; Stars, Wolf-Rayet ;
Magnitudes ; Photometry, SDSS
Keywords: techniques: high angular resolution - surveys - astrometry -
binaries: visual - stars: early type - stars: massive
Abstract:
Massive stars have high-multiplicity fractions, and many of them have
still undetected components, thus hampering the study of their
properties.
I study a sample of massive stars with high angular resolution to
better characterize their multiplicity.
I observed 138 fields that include at least one massive star with
AstraLux, a lucky imaging camera at the 2.2m Calar Alto telescope.
I also used observations of 3 of those fields with ACS/HRC on HST
to obtain complementary information and to calibrate the AstraLux
data. The results were compared with existing information from the
Washington Double Star Catalog, Tycho-2, 2MASS, and other literature
results.
Description:
File table2 contains the ACS/HRC measurements and file table3 the
AstraLux measurements.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 74 15 List and properties of the detected pairs in
the ACS/HRC data
table3.dat 105 142 List and properties of the detected pairs in
the AstraLux data
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name System name
19- 24 A6 --- Filt Filter used for observations
26- 30 A5 --- m_Name Pair identification within system
32- 39 F8.2 d MJD Modified Julian Date of the observation
41- 46 F6.3 arcsec Sep Separation
48- 52 F5.3 arcsec e_Sep rms uncertainty in separation
54- 59 F6.2 deg PA Orientation
61- 64 F4.2 deg e_PA rms uncertainty in orientation
66- 69 F4.2 mag dmag Magnitude difference
71- 74 F4.2 mag e_dmag rms uncertainty in magnitude difference
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name System name
19- 28 A10 --- WDS Washington Double Star (B/wds) identification
30- 34 A5 --- m_WDS Pair identification within system
36- 43 F8.2 d MJD Modified Julian Date of the observation
45- 50 F6.3 arcsec Sep Separation of the components
52- 56 F5.3 arcsec e_Sep rms uncertainty in separation
58- 63 F6.2 deg PA Orientation (N to E)
65- 68 F4.2 deg e_PA rms uncertainty in orientation
70 A1 --- f_WDS [y/n] Pair in WDS? (yes/no)
72 A1 --- u_dVT [a] Quality flag (1)
74- 78 F5.2 mag dVT ?=- Tycho-2 V magnitude difference
80- 84 F5.2 mag dz SDSS z magnitude difference (AstraLux)
86- 89 F4.2 mag e_dz rms uncertainty in SDSS z magnitude difference
91 A1 --- u_dH [a] Quality flag (1)
93- 97 F5.2 mag dH ?=- 2MASS H magnitude difference
99 A1 --- u_dK [ab] Quality flag (1)
101-105 F5.2 mag dK ?=- 2MASS K magnitude difference
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Note (1): Flags as follows:
a = Large (>0.2 mag) photometric uncertainty
b = Low photometric quality (X flag)
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Acknowledgements:
Jesus Maiz Apellaniz, jmaiz(at)iaa.es
(End) Patricia Vannier [CDS] 29-Apr-2010