J/AJ/138/963 Rotation of NGC 2264 members (Baxter+, 2009)
The distance to NGC 2264.
Baxter E.J., Covey K.R., Muench A.A., Furesz G., Rebull L.,
Szentgyorgyi A.H.
<Astron. J., 138, 963-974 (2009)>
=2009AJ....138..963B 2009AJ....138..963B
ADC_Keywords: Clusters, open ; Rotational velocities ;
Keywords: methods: statistical -
open clusters and associations: individual (NGC 2264) -
stars: distances - stars: formation - stars: rotation
Abstract:
We determine the distance to the open cluster NGC 2264 using a
statistical analysis of cluster member inclinations. We derive
distance-dependent values of sini (where i is the inclination angle)
for 97 stars in NGC 2264 from the rotation periods, luminosities,
effective temperatures, and projected equatorial rotation velocities,
vsini, measured for these stars. We have measured 96 of the vsini
values in our sample by analyzing high-resolution spectra with a
cross-correlation technique. We model the observed distribution of sin
i for the cluster by assuming that member stars have random axial
orientations and by adopting prescriptions for the measurement errors
in our sample. By adjusting the distance assumed in the observed sini
distribution until it matches the modeled distribution, we obtain a
best-fit distance for the cluster. We find the data to be consistent
with a distance to NGC 2264 of 913pc.
Description:
Spectra for 923 stars in and around NGC 2264 were obtained from the
sample observed by Furesz et al. (2006, Cat. J/ApJ/648/1090) using
Hectochelle, a multiobject echelle spectrograph located on the 6.5m
Multiple Mirror Telescope (MMT).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 97 Data used to create sini distribution
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See also:
J/ApJ/648/1090 : Radial velocities of NGC 2264 stars (Furesz+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
13- 22 F10.7 deg DEdeg Declination in decimal degrees (J2000)
24- 29 F6.3 [10-7W] logLbol Bolometric luminosity (erg/s)
31- 35 F5.3 [K] logTeff Effective temperature
37 A1 --- Ref [SP] Lbol and Teff source (1)
39- 43 F5.2 d Per Rotation period
46- 49 F4.1 km/s vsini Projected rotational velocity
51- 55 F5.2 km/s e_vsini rms uncertainty on vsini
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Note (1): Type of reddening correction applied to each star's photometry in
estimating its luminosity and temperature:
* stars with an "S" have individual reddening estimates based on
observed spectral types, while
* stars labeled "P" had photometry corrected assuming the modal extinction
derived for cluster members by Rebull et al. (2006AJ....131.2934R 2006AJ....131.2934R).
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Nomenclature Notes:
Source identified as [BCM2009] DDD.ddddddd+DD.ddddddd in Simbad.
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Jan-2012