J/AJ/129/856 Herbig Ae/Be stars in nearby OB associations (Hernandez+, 2005)
Herbig Ae/Be stars in nearby OB associations.
Hernandez J., Calvet N., Hartmann L., Briceno C., Sicilia-Aguilar A.,
Berlind P.
<Astron. J., 129, 856-871 (2005)>
=2005AJ....129..856H 2005AJ....129..856H
ADC_Keywords: Associations, stellar ; Clusters, open ; Stars, pre-main sequence
Keywords: Hertzsprung-Russell diagram -
open clusters and associations: general - stars: emission-line, Be -
stars: pre-main-sequence
Abstract:
We have carried out a study of the early-type stars in nearby OB
associations spanning an age range of ∼3-16Myr, with the aim of
determining the fraction of stars that belong to the Herbig Ae/Be
class. We studied the B, A, and F stars in the nearby (≤500pc) OB
associations Upper Scorpius, Perseus OB2, Lacerta OB1, and Orion OB1,
with membership determined from Hipparcos (Cat. I/239) data. We also
included in our study the early-type stars in the Trumpler 37 cluster,
part of the Cep OB2 association. We obtained spectra for 440 Hipparcos
stars in these associations, from which we determined accurate
spectral types, visual extinctions, effective temperatures,
luminosities and masses, using Hipparcos photometry.
Description:
We obtained low-dispersion spectra for the selected stars during 2000
and 2003 using the 1.5m telescope of the Whipple Observatory with the
FAST spectrograph, equipped with the Loral 512x2688 CCD.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 87 440 Stellar properties
table3.dat 83 23 Emission-line stars
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See also:
J/A+A/289/101 : Orion OB1 association. I. (Brown+, 1994)
J/AJ/124/404 : Upper Scorpius OB assoc. Li survey. II. (Preibisch, 2002)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/AJ/121/1040 : PMS members of upper Scorpius OB assoc. (Preibisch+, 2001)
II/36 : UBV and uvby-beta obs. of Orion OB1 Assoc. (Warren+ 1977)
J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Loc Location (association name)
16- 18 A3 --- --- [HIP]
19- 24 I6 --- HIP ? Hipparcos identification (Cat. I/239)
27 A1 --- f_HIP [1] Star with Hα emission (see Table 3)
29- 38 A10 --- Name Stellar name
40- 41 A2 --- SpType Spectral type
43 I1 --- e_SpType Error in SpType
45- 49 F5.2 mag AV Extinction in the V band
51- 54 F4.2 mag e_AV The 1σ error in AV
56- 60 F5.2 mag Jmag The J band magnitude (1)
62- 66 F5.2 mag J-H The (J-H) color index (1)
68- 72 F5.2 mag H-Ks The (H-KS) color index (1)
74- 77 F4.2 [K] logT Log of the stellar effective temperature
79- 82 F4.2 [solLum] logL Log of the stellar luminosity
84- 87 F4.1 solMass Mass ? Stellar mass
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Note (1): Two Micron All Sky Survey (2MASS, Cat. II/246) colors are used.
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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- 3 A3 --- --- [HIP]
5- 10 I6 --- HIP ? Hipparcos identification (Cat. I/239)
12- 35 A24 --- OName Other name
39- 47 A9 --- Assoc Association to which the star belongs
49- 53 F5.1 0.1nm EW(Ha) Equivalent width of Hα in Angstroms
55- 58 F4.1 0.1nm EW(Hb) ? Equivalent width of Hβ in Angstroms
60- 64 A5 --- Type Type of star
66- 75 A10 --- IRAS Associated IRAS source
77 A1 --- f_Beta Flag on Beta
78- 81 F4.1 --- Beta β index (1)
83 A1 --- Inner [?YN] Inner disk
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Note (1): The spectral index β, using the ratio of the IRAS flux
at 12µm F12 to the flux in the visual band (FV), is defined
to discriminate HAeBe stars from weaker infrared sources such as
CDe or Vega-like stars:
β=0.75xlog(F12/FV)-1
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 25-Aug-2005