J/A+A/478/667 The Mayrit catalogue (Caballero, 2008)
Stars and brown dwarfs in the sigma Orionis cluster: the Mayrit catalogue.
Caballero J.A.
<Astron. Astrophys. 478, 667 (2008)>
=2008A&A...478..667C 2008A&A...478..667C
ADC_Keywords: Clusters, open ; Photometry, infrared
Keywords: astronomical data bases: miscellaneous -
stars: low-mass, brown dwarfs -
Galaxy: open clusters and associations: individual: sigma Orionis
Abstract:
The young sigma Orionis cluster is an indispensable basis for
understanding the formation and evolution of stars, brown dwarfs and
planetary-mass objects. Our knowledge of its stellar population is,
however, incomplete. I present the Mayrit catalogue, that comprises
most of the stars and high-mass brown dwarfs of the cluster. The basis
of this work is an optical-near infrared correlation between the 2MASS
and DENIS catalogues in a circular area of radius 30 arcmin centred on
the OB-type binary sigma Ori AB. The analysis is supported on a
bibliographic search of confirmed cluster members with features of
youth and on additional X-ray, mid-infrared and astrometric data. I
list 241 sigma Orionis stars and brown dwarfs with known features of
youth, 97 candidate cluster members (40 are new) and 115 back- and
foreground sources in the survey area. The 338 cluster members and
member candidates constitute the Mayrit catalogue. This catalogue is a
suitable input for studying the spatial distribution, multiplicity,
properties and frequency of discs and the complete mass function of
sigma Orionis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 106 241 Confirmed cluster young stars and brown dwarfs
tablea2.dat 102 85 Fore- and background stars
tablea3.dat 105 18 Galaxies in the survey area
tablea4.dat 101 12 Probable reddened sources in the NE nebulosity
tablea5.dat 81 97 Candidate cluster young stars and brown dwarfs
tablea6.dat 91 338 The Mayrit catalogue
tablea7.dat 113 67 References
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See also:
B/denis : The DENIS database (DENIS Consortium, 2005)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
III/177 : H-alpha emission stars in Orion region (Wiramihardja+ 1993)
J/A+A/289/101 : Orion OB1 association. I. (Brown+, 1994)
J/A+A/419/249 : RJHKs photometry of sigma Ori low-mass stars (Scholz+, 2004)
J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004)
J/MNRAS/356/89 : sigma Ori low-mass stars (Kenyon+, 2005)
J/MNRAS/356/1583 : RV of Sigma Ori low-mass cand. members (Burningham+, 2005)
J/A+A/446/501 : XMM observations of sigma Ori cluster (Franciosini+, 2006)
J/A+A/466/917 : Brightest stars of sigma Orionis cluster (Caballero+, 2007)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [Mayrit]
8- 14 A7 --- Mayrit Mayrit designation
16- 55 A40 --- AltName Alternative name(s) (1)
57- 83 A27 --- Features Youth feature(s) (2)
85-106 A22 --- Refs Reference(s), in tablea7.dat
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Note (1): If there are more than one alternative names, then they are
separated by commas. The oldest designation is listed first (except
for stars with variable star nomenclature).
Note (2): Youth feature(s) as follows:
OB = early spectral type
Li I = Li I lambda6707.8 AA in absorption
Halpha = strong and/or broad Halpha lambda6562.8Å in emission
low g = features of low gravity
Class I = SED characteristic of objects with discs
II = SED characteristic of objects with discs
trans. disc. = SED characteristic of objects with discs
ev. disc = SED characteristic of objects with discs
mIR = SED characteristic of objects with discs
XX = very strong X-ray emission
XXX = very strong X-ray emission
Some additional features of youth: emission lines different from
Halpha, silicon features in mid-infrared spectra, debris discs, X-ray
flares, Herbig-Haro jets, moderate X-ray emission. Some
marginally-detected features are indicated with a question mark.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [2MASS]
7- 23 A17 --- 2MASS 2MASS designation (JHHMMSSss-DDMMsss)
25- 43 A19 --- AltName Alternative name(s)
45 I1 --- Sp [0/1] Published Spectrum Flag (1)
47 A1 --- l_pmRA Limit flag on proper motion
48- 52 F5.1 mas/yr pmRA ?=- Proper motion along right ascension
(or 10. if upper limit) (2)
53 A1 --- --- [,]
54- 59 F6.1 mas/yr pmDE ? Proper motion along declination (2)
61- 86 A26 --- Rem Remarks (3)
87-102 A16 --- Refs Reference(s), in tablea7.dat
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Note (1): The number means:
0 = without published spectrum ("No" in original paper)
1 = with published spectrum ("Yes" in original paper)
Note (2): Note on proper motion:
if I>12.5mag: ellipsis (---);
if I<12.5mag: USNO-B1 proper motions, only if
modulus(proper motion) >10mas/yr.
Note (3): Remarks as follows:
no Li I = stars whose high-quality spectra show no lithium in absorption
no low g = no low gravity features in the alkali lines;
no Vr = discordant radial velocity with respect to the cluster
systemic radial velocity.
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Byte-by-byte Description of file: tablea[34].dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [2MASS]
7- 23 A17 --- 2MASS 2MASS designation (JHHMMSSss-DDMMsss)
25- 38 A14 --- AltName Alternative name
41- 46 F6.3 mag Imag Apparent magnitude in DENIS I band
48- 51 F4.2 mag e_Imag Magnitude error in DENIS I band
53- 58 F6.3 mag Jmag Apparent magnitude in 2MASS J band
60- 64 F5.3 mag e_Jmag Magnitude error in 2MASS J band
66- 71 F6.3 mag Kmag Apparent magnitude in 2MASS Ks band
73- 77 F5.3 mag e_Kmag Magnitude error in 2MASS Ks band
79- 89 A11 --- Rem Remarks (1)
91-105 A15 --- Refs Reference(s), in tablea7.dat
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Note (1): The remarks column indicates, if known, spectral type, period of
photometric variability, and moderate X-ray emission. The marginal
detections of youth features (Li I, Halpha, low g) are indicated with
a question mark.
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [Mayrit]
8- 14 A7 --- Mayrit Mayrit designation
17- 39 A23 --- AltName Alternative name
41- 64 A24 --- Remarks Remarks (1)
65- 81 A17 --- Refs Reference(s), in tablea7.dat
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Note (1): The remarks column indicates, if known, spectral type, period of
photometric variability, and moderate X-ray emission. The marginal
detections of youth features (Li I, Halpha, low g) are indicated with
a question mark.
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Byte-by-byte Description of file: tablea6.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [Mayrit]
8- 14 A7 --- Mayrit Mayrit designation
16- 17 I2 h RAh Right Ascension J2000 (hours)
19- 20 I2 min RAm Right Ascension J2000 (minutes)
22- 26 F5.2 s RAs Right Ascension J2000 (seconds)
28 A1 --- DE- Declination J2000 (sign)
29- 30 I2 deg DEd Declination J2000 (degrees)
32- 33 I2 arcmin DEm Declination J2000 (minutes)
35- 38 F4.1 arcsec DEs Declination J2000 (seconds)
40- 45 F6.3 mag Imag Apparent magnitude in DENIS I band
47- 50 F4.2 mag e_Imag Magnitude error in DENIS I band
52- 57 F6.3 mag Jmag Apparent magnitude in 2MASS J band
59- 63 F5.3 mag e_Jmag Magnitude error in 2MASS J band
65- 70 F6.3 mag Hmag Apparent magnitude in 2MASS H band
72- 76 F5.3 mag e_Hmag Magnitude error in 2MASS H band
78- 83 F6.3 mag Kmag Apparent magnitude in 2MASS Ks band
85- 89 F5.3 mag e_Kmag Magnitude error in 2MASS Ks band
91 I1 --- Y [0/1] Young Flag (1)
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Note (1): The number means:
0 = without known features of youth (void in original paper)
1 = with known feature(s) of youth (filled star in original paper)
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Byte-by-byte Description of file: tablea7.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ref Reference code
8- 26 A19 --- BibCode BibCode
28- 53 A26 --- Aut Author's name
55-113 A59 --- Com Comments
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Nomenclature Notes:
The Mayrit designation of the sigma Orionis cluster members and
candidates used throughout this work follows the nomenclature
introduced by Caballero (2007AN....328..917C 2007AN....328..917C). The acronym Mayrit
comes from the Arabic /al-Majrit/ "source of water", from where the
name of the city of Madrid evolved. This is a tribute to the Arabic
Astronomy, which gave the names to Alnilam, Alnitak and Mintaka, the
other three bright stars of the Orion Belt.
History:
* 17-Jan-2008: Original version
* 13-Jan-2009: In tablea6, for Mayrit 839077, the declination (-02 32 52.3)
was corrected into -02 32 25.3 by CDS.
One correction in tablea2.dat
Acknowledgements:
Jose A. Caballero, caballero(at)astrax.fis.ucm.es
(End) J.A. Caballero [Univ. Complutense de Madrid], P. Vannier [CDS] 03-Jan-2008