II/345 JMDC : JMMC Measured Stellar Diameters Catalogue (Duvert, 2016)
Compendium of Direct Measurement of Apparent Stellar Diameters.
(Initially introduced as part of Chelli et al., 2016A&A...589A.112C 2016A&A...589A.112C).
Duvert G.
=2016yCat.2345....0D 2016yCat.2345....0D
ADC_Keywords: Stars, diameters
Keywords: stars: fundamental parameters - techniques: data analysis -
techniques: interferometric - astronomical database: miscellaneous -
catalogs
Abstract:
This catalog lists all measurements of stellar apparent diameters made
with "direct" techniques: optical interferometry, intensity
interferometry and lunar occultations that have been published since
the first experiments by Michelson.
Description:
Several star diameter compilations exist that contain a fair amount of
stellar angular diameter measurements. The CADARS (2011, Cat. II/224)
has entries for 6888 stars and claims completeness up to 1997. CHARM2
(2005, Cat. J/A+A/431/773) lists 8231 measurements of 3243 stars, up
to 2005. However all these catalogs mix results from very direct
methods, such as intensity interferometry, with indirect methods, or
spectrophotometric estimates of various kind (always including some
model of the star), or linear diameters from eclipsing binaries (1600
entries in CADARS), which need some modelling of the two stars, as
well as a good estimate of the distance to be converted into an
angular diameter.
In contrary, the present catalogue, called JMDC (for JMMC Measured
stellar Diameters Catalog) is focussed on direct methods only, and
selects only one value of the uniform-disk diameter (UDD) and/or
limb-darkened diameter (LDD) for each historical measurement.
Until 2020, this catalog has been updated manually. Now a web
interface has been setup at JMMC (jmdc.jmmc.fr) to submit new
measurements and browse the catalog. Please submit your new
measurements! The CDS copy will be updated yearly.
The current version (Q3 2021) gathers 2013 measurements that have been
published since the first experiments by Michelson. Prior to 1997, our
bibliography relies only on the reference list of CADARS, carefully
reviewed. After this date we used NASA's ADS hosted at CDS. We
retained only the measurements obtained from visible/IR
interferometry, intensity interferometry and lunar occultation in the
database. We always retrieved the values in the original text and used
SIMBAD to properly and uniquely identify the stars.
The three techniques retained share the same method of converting the
measurements (squared visibilities for optical interferometry,
correlation of photon-counts for intensity interferometry, fast
photometry for lunar occultations) into an angular diameter: fitting a
geometrical function into the values, in many cases a uniform disk,
which provides a uniform disk diameter (UDD) value. This UDD is
wavelength-dependent owing to the limb-darkening effect of the upper
layers of a star's photosphere, and JMDC retains the wavelength or
photometric band at which the observation was made. To measure a
star's apparent diameter consistently, i.e., with the same meaning as
our Sun's well-resolved apparent diameter, it was necessary for the
authors of these measurements to take into account the star's
limb-darkening, for which only theoretical estimates exist as yet.
They chose one of the various limb-darkening parameters available in
the literature, either by multiplying the UDD by a coefficient
function of the wavelength and the star's adopted effective
temperature, or directly fitting a limb-darkened disk model in the
data. Of course this adds some amount of theoretical bias in the
published measurements, which however diminishes as the wavelength
increases. An additional difficulty for the lunar occultations is that
the result depends on the exact geometry of the occulting portion of
the lunar limb, which can, more or less, be correctly estimated.
To deal with the limb-darkening problem as efficiently as possible, in
the publications where reported diameters are measured in several
optical/IR bands, we retain the measurement with the best accuracy and
favor the measurement at the longest wavelength to minimize the effect
of limb-darkening correction. When the publication include both LDD
and UDD values, we report both, and, if available, the conversion
coefficient used.
We provide in the Notes additional information, such as the eventual
binarity of the star, possible erroneous measurements, origin the of
limb-darkening factor used, duplication with other publications etc...
as weel as more "in-house" comments related to the proper use of this
database, initially in the companion publication 2016A&A...589A.112C 2016A&A...589A.112C
and now for the maintainance and improvement of the JMMC SearchCal
tool.
In the paper 2016A&A...589A.112C 2016A&A...589A.112C, we further use the published UDD
measurement, or retrieve the original, unpublished UDD measurement
from the LDD value and the limb-darkening coefficient used by the
authors. We then convert these UDD values into limb-darkened angular
diameters using mainly the coefficients from J/A+A/556/A86/table16 and
J/A+A/554/A98/table16 when possible (compatible spectral types) and
following the prescriptions of the JMMC report JMMC-MEM-2610-001
(http://www.mariotti.fr/doc/approved/JMMC-MEM-2610-0001.pdf) in all
other cases. As the limb-darkening coefficients depend on the
effective temperature and surface gravity as well as some model of the
stellar photosphere, these "revised" LDDs are not part of the present
catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
jmdc.dat 335 2013 JMMC Measured stellar Diameters Catalog
(as part of Chelli et al., 2016A&A...589A.112C 2016A&A...589A.112C)
jmdc.fits 2880 209 FITS version of the catalog
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See also:
II/224 : Catalog of Stellar Diameters (CADARS)
(Pasinetti-Fracassini+ 2001)
J/A+A/431/773 : CHARM2, an updated of CHARM catalog (Richichi+, 2005)
J/A+A/556/A86 : FGK dwarf stars limb darkening coefficients (Neilson+, 2013)
Byte-by-byte Description of file: jmdc.dat
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Bytes Format Units Label Explanations
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1- 28 A28 --- ID1 Normalised star name (preferably HD) (ID1)
30- 57 A28 --- ID2 Name used in the original publication (ID2)(1)
59- 67 F9.5 mas UDdiam ?=- Uniform Disk Diameter (UD_MEAS)
69- 75 F7.4 mas LDdiam ?=- Limb-Darkened Disk diameter (LD_MEAS)
77- 84 F8.4 mas e_LDdiam ?=- Error on UDdiam and LDdiam (ELDMEAS) (2)
86- 95 A10 --- Band Text describing the wavelength or band
of the measurement (BAND) (3)
97-103 F7.5 --- mu-lambda ?=- When possible, value of the conversion
UDD-to-LDD user by the author (MU_LAMBDA)
105 I1 --- Method [1/3] Integer code of the method used
(METHOD) (4)
107-108 I2 --- BandCode ?=- Integer code of the band used
(BANDCODE) (5)
110-313 A204 --- Notes Note about the star and/or measurement (NOTES)
315-333 A19 --- BibCode BibCode
335 I1 --- SINPE ? boolean flag (6)
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Note (1): Provided the publication name is recognized by the Sesame name
resolver.
Note (2): In general, quotes the published error on LDD or UDD, which are
essentially equivalent. The blanking value of "---" can be due to an absence of
published error, or has been fixed thus when the measurement is
(retrospectively) in doubt, in which case an explanation lies in the Notes.
Note (3): A loosely defined string representing the band (UBVRIJHKLMNQ) or the
central wavelength, in microns if not otherwise precised, of the observation.
A stands for Angstroem, nm for nanometer.
Note (4): Code for the observational method used as follows:
1 = optical interferometry
2 = Lunar occultation
3 = intensity interferometry
Note (5): Index from 1 (band U) and up through bands B,V,R,I,J,H,K,L,M,N,Q.
Note (6): Simbad identifiant is not precise enough for this object, usually a
component of a close double star.
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History:
* 28-Nov-2016: First version with 1239 measurements
* 29-Mar-2018: New version with 1478 measurements
* 16-Jan-2019: New version with 1554 measurements
* 03-Feb-2020: New version with 1672 measurements
* 10-Sep-2021: New version with 2013 measurements
* 13-Sep-2021: New version with 2013 measurements
Acknowledgements:
Gilles Duvert, gilles.duvert(at)univ-grenoble-alpes.fr
(End) Gilles Duvert [IPAG, OSUG, France], Patricia Vannier [CDS] 17-Nov-2016