Access to Astronomical Catalogues

← Click to display the menu
J/A+A/462/123    VLT/Flames spectroscopic data of NGC 6530   (Prisinzano+, 2007)

VLT/Flames observations of the star forming region NGC 6530. Prisinzano L., Damiani F., Micela G., Pillitteri I. <Astron. Astrophys. 462, 123 (2007)> =2007A&A...462..123P
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Spectroscopy ; Radial velocities ; Rotational velocities Keywords: stars: pre-main sequence - stars: rotation - accretion, accretion disks Abstract: Mechanisms regulating the evolution of pre-main sequence stars can be understood by studying stellar properties such as rotation, disk accretion, internal mixing and binarity. To investigate such properties, we studied a sample of 332 candidate members of the massive and populous star forming region NGC 6530. We want to select cluster members by using different membership criteria, to study the properties of pre-main sequence stars with or without circumstellar disks. We use intermediate resolution spectra including the LiI6707.8Å line to derive radial and rotational velocities, binarity and to measure the Equivalent Width of the lithium line; these results are combined with X-ray data to study the cluster membership. Optical-IR data and Hα spectra, these latter available for a subsample of our targets, are used to classify CTTS and WTTS and to compare the properties of stars with and without disks. We find a total of 237 certain members including 53 binaries. The rotational velocity distributions of stars with IR excesses are statistically different from that of stars without IR excesses, while the fraction of binaries with disks is significantly smaller than that of single stars. Stars with evidence for accretion show circumstellar disks; youth of cluster members is confirmed by the lithium abundance consistent with the initial content. As indicated by the disk-locking picture, stars with disks have in general rotational velocities lower than stars without disks. Binaries in NGC 6530 seem have undergone a significant disk evolution. Description: New spectroscopic results and literature optical and IR photometry of a sample of candidate members of the Star Forming Region NGC 6530 are presented. The selected targets were observed with the GIRAFFE-FLAMES multi-object fiber spectrograph of the ESO-VLT Kueyon Telescope. Results from spectra obtained using the MEDUSA fibre system with the setup HR15, which gives a resolution R=19300 in the wavelength range [6606,6905]Å, and with the setup HR14, which gives a resolution R=28800 in the wavelength range [6383,6626]Å, are given. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 130 332 Target positions and optical-IR magnitudes table3.dat 85 332 Spectroscopic results
See also: J/A+A/430/941 : Star formation region NGC 6530 (Prisinzano+, 2005) J/ApJ/608/781 : NGC 6530 Chandra X-ray catalog (Damiani+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000.0) 4- 5 I2 min RAm Right ascension (J2000.0) 7- 11 F5.2 s RAs Right ascension (J2000.0) 13 A1 --- DE- Declination sign (J2000.0) 14- 15 I2 deg DEd Declination (J2000.0) 17- 18 I2 arcmin DEm Declination (J2000.0) 20- 24 F5.2 arcsec DEs Declination (J2000.0) 26- 29 I4 --- Sp Spectrum number 31- 33 I3 --- IDX ?=- Designation from Damiani et al. (2006A&A...459..477D) 35- 39 I5 --- WFI Designation from Prisinzano et al. (2005, Cat. J/A+A/430/941, Cl* NGC 6530 WFI NNNNN in Simbad) 41- 46 F6.3 mag Bmag Landolt B magnitude from J/A+A/430/941 48- 52 F5.3 mag e_Bmag rms uncertainty on the Landolt B magnitude 54- 59 F6.3 mag Vmag Landolt V magnitude from J/A+A/430/941 61- 65 F5.3 mag e_Vmag rms uncertainty on the Landolt V magnitude 67- 72 F6.3 mag Imag Cousins I magnitude from J/A+A/430/941 74- 78 F5.3 mag e_Imag rms uncertainty on the Cousins I magnitude 80- 85 F6.3 mag Jmag ?=- J magnitude from 2MASS II/246 87- 91 F5.3 mag e_Jmag ?=- rms uncertainty on the J magnitude 93- 98 F6.3 mag Hmag ?=- H magnitude from 2MASS II/246 100-104 F5.3 mag e_Hmag ?=- rms uncertainty on the H magnitude 106-111 F6.3 mag Kmag ?=- K magnitude from 2MASS II/246 113-117 F5.3 mag e_Kmag ?=- rms uncertainty on the K magnitude 119-123 F5.2 Myr Age Estimated age from J/A+A/430/941 125-130 F6.2 solMass Mass ?=-99.99 Estimated mass from J/A+A/430/941
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Sp Spectrum number 6 A1 --- SB2 [Y] Binarity flag 8- 14 F7.2 km/s RV ?=- Radial velocity 16- 20 F5.2 km/s e_RV ?=- rms uncertainty on RV 22- 27 F6.2 km/s vsini ?=- Rotational velocity 29- 33 F5.2 km/s e_vsini ?=- rms uncertainty on vsini 35- 38 I4 K Teff Effective Temperature from V-I color index (from J/A+A/430/941) 40- 44 F5.1 0.1nm EW(Li) ?=- Equivalent width of the lithium line 46- 50 F5.1 0.1nm EW2(Li) ?=- Equivalent width of the lithium line of the second component 52- 55 F4.1 0.1nm FWZI(Ha) ?=- Full Width Zero Intensity of Hα line 57 A1 --- MembX [YN] Membership flag based on X-ray detection 59 A1 --- MembRV [YN] Membership flag based on radial velocity 61 A1 --- MembLi [YN] Membership flag based on lithium equivalent width 63- 64 A2 --- QJHHK [Y-N] IR excess flag based on the QJHHK index 66- 67 A2 --- QVIJK [Y-N] IR excess flag based on the QVIJK index 69- 70 A2 --- QVIIJ [Y-N] IR excess flag based on the QVIIJ index 72- 73 A2 --- QBVJK [Y-N] IR excess flag based on the QBVJK index 75- 76 A2 --- Class [CW ?-] CTT or WTT classification based on the Hα line (1) 78- 82 A5 --- PT Profile type of the Halpha line (2) 84- 85 A2 --- Memb [M NM?] Membership (M=member, NM=non member)
Note (1): Classification as follows: C = CTTS (Classical T Tau star) C? = possible CTTS W = WTT (Weak-lined T Tauri stars) Note (2): Profile type of the Hα line as follows: AE = broad absorption Hα line, with the core filled of the narrow nebular emission Hα EG = quite symmetric and "narrow" line profile, likely originated only from the nebular emission YY = YY Ori profile (inverse P Cygni profile) CE? = slight broad wings which can be due to "normal" chromospheric emission or to low accretion PCI = Type I P Cygny profile PCIII = Type III P Cygny profile
History: * 31-Oct-2006: Original version * 15-May-2007: IDX label reference corrected Acknowledgements: Loredana Prisinzano, loredana(at)astropa.unipa.it
(End) Patricia Vannier [CDS] 31-Oct-2006
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

catalogue service

© UDS/CNRS

Contact