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J/ApJ/653/657   Spectroscopic observations of Herbig Ae/Be stars (Manoj+, 2006)

Evolution of emission-line activity in intermediate-mass young stars. Manoj P., Bhatt H.C., Maheswar G., Muneer S. <Astrophys. J., 653, 657-674 (2006)> =2006ApJ...653..657M
ADC_Keywords: Stars, pre-main sequence ; Photometry ; Equivalent widths Keywords: circumstellar matter - planetary systems: protoplanetary disks - stars: emission-line, Be - stars: pre-main-sequence - techniques: spectroscopic Abstract: We present optical spectra of 45 intermediate-mass Herbig Ae/Be stars. Together with the multiepoch spectroscopic and photometric data compiled for a large sample of these stars and ages estimated for individual stars by using pre-main-sequence evolutionary tracks, we have studied the evolution of emission-line activity in them. We find that, on average, the Hα emission line strength decreases with increasing stellar age in Herbig Ae/Be stars, indicating that the accretion activity gradually declines during the pre-main-sequence phase. Description: Optical CCD spectra centered at the Hα line (lambda∼6252Å) were obtained for 45 stars in our sample with the Optomechanics Research (OMR) spectrograph on the 2.34m Vainu Bappu Telescope (VBT) at the Vainu Bappu Observatory, Kavalur, India, and with the Hanle Faint Object Spectrograph (HFOSC) on the 2m Himalayan Chandra Telescope at the Indian Astronomical Observatory, Hanle, India. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 50 91 Basic data for 91 Herbig Ae/Be stars compiled from literature table2.dat 65 45 Log of spectroscopic observations object table3.dat 50 91 Masses and ages of Herbig Ae/Be stars table4.dat 56 91 Hα equivalent widths of Herbig Ae/Be stars table5.dat 54 62 2MASS magnitudes of Herbig Ae/Be stars refs.dat 68 39 References
See also: J/AJ/106/656 : Herbig Ae/Be stars (Brooke+, 1993) J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994) J/A+AS/111/399 : Polarization variability in Herbig Ae/Be stars (Jain+, 1995) J/A+AS/136/429 : Herbig Ae/Be stars candidates (Corporon+ 1999) J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name 12- 16 F5.2 mag Vmag Johnson V band magnitude 18- 21 F4.2 mag B-V Johnson (B-V) color index 23- 27 F5.2 mag Rmag ?=99.990 Johnson R band magnitude 29- 30 I2 --- r_Rmag The photometry reference in refs.dat file 32- 39 A8 --- SpType MK spectral type 41- 42 I2 --- r_SpType Reference for SpType in refs.dat file 44- 47 I4 pc Dist Distance 49- 50 I2 --- r_Dist Reference on Dis in refs.dat file
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name 14- 15 I2 h RAh Right ascension (J2000) 17- 18 I2 min RAm Right ascension (J2000) 20- 23 F4.1 s RAs Right ascension (J2000) 25 A1 --- DE- Declination sign (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 33 I2 arcsec DEs Declination (J2000) 35- 44 A10 "YYYY/DD/MM" Obs.date Observation date 46- 50 A5 "h:m" Obs.time UT start of observation 52- 55 I4 s ExpTime Exposure Time 57- 65 A9 --- Spect/Inst Spectrograph/Instrument
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name 12- 15 F4.2 [K] logT Log of the effective temperature 17- 20 F4.2 mag E(B-V) The (B-V) color excess 22- 26 F5.2 mag R Ratio of total-to-selective extinction 28- 32 F5.2 mag AV The V band extinction 34- 37 F4.2 [solLum] logL Log of the luminosity 39 A1 --- l_Mass Limit flag on Mass 40- 43 F4.2 solMass Mass Derived mass 45 A1 --- l_Age Limit flag on Age 46- 50 F5.2 Myr Age Derived age
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name (1) 12- 18 F7.2 0.1nm Now ? Hα equivalent width from this work 20- 25 F6.2 0.1nm HB88 ? Herbig & Bell (1988, Cat. V/73) Hα equivalent width 27- 33 F7.2 0.1nm Her04 ? Hernandez et al. (2004AJ....127.1682H) Hα equivalent width 35- 40 F6.2 0.1nm CR98 ? Corcoran & Ray (1998A&A...331..147C) Hα equivalent width 42- 48 F7.2 0.1nm AVD05 ? Acke et al. (2005A&A...436..209A) Hα equivalent width 50- 56 F7.2 0.1nm BPL96 ? Reipurth et al. (1996A&AS..120..229R) Hα equivalent width
Note (1): All equivalent widths given in Angstroms. Negative values of equivalent widths signifies emission.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Object name 12- 27 A16 --- 2MASS The 2MASS designation (HHMMSSss+DDMMSSs) 29- 33 F5.2 mag Jmag 2MASS J band magnitude 35- 39 F5.2 mag Hmag 2MASS H band magnitude 41- 44 F4.2 mag Ksmag 2MASS Ks band magnitude 46- 49 F4.2 mag Del(H-Ks) Intrinsic (H-Ks) color excess (1) 51- 54 F4.2 mag e_Del(H-Ks) Error on Del(H-Ks)
Note (1): Due to thermal emission from the inner disk by subtracting the photospheric color and color due to interstellar and large scale circumstellar reddening from the observed colors.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 45 A22 --- Aut Author's name 47- 68 A22 --- Com Comments
History: * 10-Nov-2008: From electronic version of the journal * 05-Feb-2014: In table4, label logM corrected into M
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 31-Jul-2008
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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