Information on Service 'MWSC Member Search'

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Further access options are discussed below

MWSC presents a list of 3006 Milky Way Stellar Clusters (MWSC), found in the 2MAst (2MASS with Astrometry) catalogue. The target list was compiled on the basis of present-day lists of open, globular and candidate clusters. For confirmed clusters we determined a homogeneous set of astrophysical parameters such as membership, angular radii of the main morphological parts, mean cluster proper motions, distances, reddenings, ages, tidal parameters, and sometimes radial velocities.

For a list of all services and tables belonging to this service's resource, see Information on resource 'Global Survey of Star Clusters in the Milky Way'

Overview

You can access this service using:

This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Other services provided on the underlying data include:

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
magJ m_J Magnitude in the 2MASS J band mag phot.mag;em.opt.J
magV m_V V magnitude in Johnson system. mag phot.mag;em.opt.V
MAXREC Match limit Maximum number of records returned. Pass 0 to retrieve service parameters. N/A N/A
p_jks P_(J,Ks) Probability of membership from J, Ks photometry N/A stat.probability;meta.code.member
p_kin P_kin Probability of membership from kinetic properties N/A stat.probability;meta.code.member
p_spat P_spat Probability of membership from spatial properties N/A stat.probability;meta.code.member
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
recno Cluster Id MWSC number of the cluster containing the star. N/A meta.id;meta.main
RESPONSEFORMAT Output Format File format requested for output. N/A meta.code.mime
spectral Spect. Spectral type and luminosity class N/A src.spType
SR Search Radius Search radius deg N/A
twomassid 2MASS id Unique identifier in 2MASS (pts_key) N/A meta.id;cross
VERB Verbosity Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. N/A N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.distance
cluster Cluster Information on the cluster possibly containing this star N/A meta.ref.url
dej2000 Dec Stellar Declination J2000.0, epoch 2000.0 deg pos.eq.dec;meta.main
e_pm e_PM Error of stellar proper motion deg/yr stat.error;pos.pm;pos.eq.ra
e_rv Err(RV) Error of RV km/s stat.error;spect.dopplerVeloc;pos.heliocentric
magB m_B B magnitude in Johnson system. mag phot.mag;em.opt.B
magH m_H Magnitude in the 2MASS H band mag phot.mag;em.opt.H
magJ m_J Magnitude in the 2MASS J band mag phot.mag;em.opt.J
magKs m_Ks Magnitude in the 2MASS Ks band mag phot.mag;em.opt.Ks
magV m_V V magnitude in Johnson system. mag phot.mag;em.opt.V
p_jh P_(J,H) Probability of membership from J, H photometry N/A stat.probability;meta.code.member
p_jks P_(J,Ks) Probability of membership from J, Ks photometry N/A stat.probability;meta.code.member
p_kin P_kin Probability of membership from kinetic properties N/A stat.probability;meta.code.member
p_spat P_spat Probability of membership from spatial properties N/A stat.probability;meta.code.member
pmde PM(Dec) Stellar proper motion in Declination deg/yr pos.pm;pos.eq.dec
pmra PM(RA) Stellar proper motion in RA*cos(DE) deg/yr pos.pm;pos.eq.ra
r_cl Ctr. dist. Angular distance from cluster centre deg pos.angDistance
raj2000 RA Stellar Right Ascension J2000.0, epoch 2000.0 deg pos.eq.ra;meta.main
recno Cluster Id MWSC number of the cluster containing the star. N/A meta.id;meta.main
rv RV Stellar radial velocity km/s spect.dopplerVeloc;pos.heliocentric
spectral Spect. Spectral type and luminosity class N/A src.spType

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
cluster Cluster Information on the cluster possibly containing this star N/A meta.ref.url 1
recno Cluster Id MWSC number of the cluster containing the star. N/A meta.id;meta.main 1
raj2000 RA Stellar Right Ascension J2000.0, epoch 2000.0 deg pos.eq.ra;meta.main 1
dej2000 Dec Stellar Declination J2000.0, epoch 2000.0 deg pos.eq.dec;meta.main 1
pmra PM(RA) Stellar proper motion in RA*cos(DE) deg/yr pos.pm;pos.eq.ra 5
pmde PM(Dec) Stellar proper motion in Declination deg/yr pos.pm;pos.eq.dec 5
rv RV Stellar radial velocity km/s spect.dopplerVeloc;pos.heliocentric 5
_r Dist. Distance to cone center deg pos.distance 10
magB m_B B magnitude in Johnson system. mag phot.mag;em.opt.B 15
magV m_V V magnitude in Johnson system. mag phot.mag;em.opt.V 15
magJ m_J Magnitude in the 2MASS J band mag phot.mag;em.opt.J 15
magH m_H Magnitude in the 2MASS H band mag phot.mag;em.opt.H 15
magKs m_Ks Magnitude in the 2MASS Ks band mag phot.mag;em.opt.Ks 15
e_pm e_PM Error of stellar proper motion deg/yr stat.error;pos.pm;pos.eq.ra 15
e_rv Err(RV) Error of RV km/s stat.error;spect.dopplerVeloc;pos.heliocentric 15
spectral Spect. Spectral type and luminosity class N/A src.spType 15
r_cl Ctr. dist. Angular distance from cluster centre deg pos.angDistance 15
p_spat P_spat Probability of membership from spatial properties N/A stat.probability;meta.code.member 15
p_kin P_kin Probability of membership from kinetic properties N/A stat.probability;meta.code.member 15
p_jks P_(J,Ks) Probability of membership from J, Ks photometry N/A stat.probability;meta.code.member 15
p_jh P_(J,H) Probability of membership from J, H photometry N/A stat.probability;meta.code.member 15
e_magJ Err. m_J Error in the magnitude in the 2MASS J band mag stat.error;phot.mag;em.opt.J 25
e_magH Err. m_H Error in the magnitude in the 2MASS H band mag stat.error;phot.mag;em.opt.H 25
e_magKs Err. m_Ks Error in the magnitude in the 2MASS Ks band mag stat.error;phot.mag;em.opt.Ks 25
qflg 2MASS Phot. flag 2MASS JHK photometric quality flag N/A meta.code.qual;phot 25
rflg 2MASS Qual. 2MASS photometric read flag Note r N/A meta.ref 25
bflg 2MASS blend 2MASS photometric blend flag Note b N/A meta.code 25
twomassid 2MASS id Unique identifier in 2MASS (pts_key) N/A meta.id;cross 25
ascc ASCC 2.5 id Identifier in ASCC 2.5 N/A meta.id;cross 25

VOResource XML (that's something exclusively for VO nerds)

Note b

Blend flag (upstream's bl_flg). This is a three character flag, one character per band [JHKs], that indicates the number of components that were fit simultaneously when estimating the brightness of a source:

"0"
Source is not detected, or is inconsistently deblended in that band.
"1"
One component was fit to the source in R_2 profile-fitting photometry (rd_flg="2"), or default magnitudes are from aperture photometry (rd_flg="1" or "4") or saturated star 1-d radial profile-fitting (rd_flg="3").
">1"
More than one component was fit simultaneously during R2 profile-fit photometry, where the value of the field is the number of components simultaneously fit. The maximum number of components is 7 in any band for the PSC, so this bflg is always a three character flag. Multi-component fitting occurs only for profile-fitting, and only when more than one detection is found within ~5". Single detections that are not well-fit by a single PSF are not split.
Note r

rflg is upstream's Read flag (rd_flg). It is a three character flag, one character per band [JHKs], that indicates the origin of the default magnitudes and uncertainties in each band (j_m,h_m,k_m, j_cmsig, h_cmsig, k_cmsig). rflg values of "1", "2" or "3" generally indicate the best quality detections, photometry and astrometry (although other quality flags must be considered). Values of "0", "4", "6" and "9" in a band indicate either non-detections, or generally poor quality photometry and positions. The definitions of the rflg values are:

"0"
Source is not detected in this band. The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20".
"1"
The default magnitude is derived from aperture photometry measurements on the 51 ms "Read_1" exposures. The aperture radius is 4", with the sky background measured in an annulus with an inner radius of 14" and an outer radius of 20". Used for sources that saturate one or more of the 1.3s "Read_2" exposures, but are not saturated on at least one of the 51 ms "Read_1" frames.
"2"
The default magnitude is derived from a profile-fitting measurement made on the 1.3 sec "Read_2" exposures. The profile-fit magnitudes are normalized to curve-of-growth-corrected aperture magnitudes. This is the most common type in the PSC, and is used for sources that have no saturated pixels in any of the 1.3 sec exposures.
"3"
The default magnitude is derived from a 1-d radial profile fitting measurement made on the 51 ms "Read_1" exposures. Used for very bright sources that saturate all of the 51 ms "Read 1" exposures.
"4"
The default magnitude is derived from curve-of-growth-corrected 4" radius aperture photometry measurements on the 1.3 s "Read_2" exposures. This is used for sources that are not saturated in any of the Read_2 frames, but where the profile-fitting measurements fail to converge to a solution. These magnitudes are the same as the standard aperture magnitudes (j_m_stdap, h_m_stdap, k_m_stdap), but when they are the default magnitudes, it generally implies that they are low quality measurements.
"6"
The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for pairs of sources which are detected and resolved in another band, but are detected and not resolved in this band. This differs from a rflg="0" because in this case there is a detection of the source in this band, but it is not consistently resolved across all bands.
"9"
The default magnitude is the 95% confidence upper limit derived from a 4" radius aperture measurement taken at the position of the source on the Atlas Image. The sky background is estimated in an annular region with inner radius of 14" and outer radius of 20". This is used for sources that were nominally detected in this band, but which could not have a useful brightness measurement from either profile fitting or aperture photometry. This often occurs in highly confused regions, or very near Tile edges where a significant fraction of the measurement aperture of sky annulus falls off the focal plane.