SVO archive of M dwarfs in VVV

Grant PID2020-112494GBI00 funded by
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Web access

The archive system implements a very simple search interface that permits queries by coordinates/radius and or range (*) of magnitudes. The default search radius is set to 5 arcsec. The user can also select the maximum number of sources to return (with values ranging from 10 to unlimited).

The result of the query is a HTML table with all the sources found in the archive fulfilling the search criteria. Detailed information on the output fields can be obtained placing the mouse over the question mark ("?") located close to the name of the column. Results can be sorted by just clicking on the name of the column. The archive implements the SAMP (Simple Application Messaging Protocol). SAMP allows applications to communicate with each other in a seamless and transparent way for the user. This way, the results of a query can be easily transferred to other VO applications by just clicking the "Send table to VO Apps" button.

Take into account that the number of displayed columns depends on the chosen verbosity.

(*) When a range is specified in a search the user must give both a minimum and maximum value for the corresponding quantity. If only a minimum value is given, all results with values larger than that will be obtained. If only a maximum value is given, all results with values smaller than that will be obtained.

Virtual Observatory access

The Virtual Observatory (VO) is an international initiative whose primary goal is to provide an efficient access and analysis of the information hosted in astronomical archives and services. Having a VO-compliant archive is an important added value for an astronomical project to guarantee the optimum scientific exploitation of their datasets.

Our archive system has been designed following the IVOA standards and requirements. In particular, it implements the Cone Search protocol, a standard defined for retrieving records from a catalogue of astronomical sources. The query made through the Cone Search service describes a sky position and an angular distance, defining a cone on the sky. The response returns a list of astronomical sources from the catalogue whose positions lie within the cone, formatted as a VOTable.

Frequently Asked Questions

How to make a query by magnitudes?
  • Click "Clean".
  • Fill in the appropriate boxes in the "additional search fields".
  • Mark the "Don't use coordinates as search criterion" checkbox if you don't want to restrict by coordinates (or uncheck it otherwise).
  • Click "Search"

Parameters contained in the catalogue.

Parameter Units Description
RAJ2000 deg Right Ascension (J2000).
DEJ2000 deg Declination (J2000).
GAIA_ID_DR3 - GAIA DR3 source identifier
mag_Z mag Calibrated magnitude in the Z band
emag_Z mag Calibrated magnitude error in the Z band
mag_Y mag Calibrated magnitude in the Y band
emag_Y mag Calibrated magnitude error in the Y band
mag_J mag Calibrated magnitude in the J band
emag_J mag Calibrated magnitude error in the J band
mag_H mag Calibrated magnitude in the H band
emag_H mag Calibrated magnitude error in the H band
mag_Ks mag Calibrated magnitude in the Ks band
emag_Ks mag Calibrated magnitude error in the Ks band
Dis pc Distance
Ref_dis - Reference for the distance. "Gaia DR3" refers to parallactic distances and "This work" indicates distances are spectro-photometric derived in this work.
Teff K Effective temperature
Lbol Lsun Bolometric luminosity
eLbol Lsun Error in the bolometric luminosity
Rad Rsun Stellar Radius. Calculated using Lbol = 4 PI R^2 sigma Teff^4
eRad Rsun Error in the stellar radius.
Method - Identification method of candidates. "A" stands for parallax, and "B" stands for proper motion and colour-cuts.
Flag_IR - Flag for stars with IR excess detected by VOSA yet to be confirmed.
Flag_lc - Flag for dwarfs with processed light curve.
Flag_P - Flag for dwarfs with periodic signal found.
Flag_chi - Flag for M dwarfs with chi^2 ~1 (1) and chi^2 > 2 (2).
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