J/A+A/616/L2 Planetary Nebulae distances in Gaia DR2 (Kimeswenger+, 2018) ================================================================================ Planetary nebulae distances in Gaia DR2. Kimeswenger S., Barria D. =2018A&A...616L...2K (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Planetary nebulae ; Stars, distances ; Parallaxes, trigonometric Keywords: astrometry - parallaxes - planetary nebulae: general Abstract: Planetary Nebula distance scales often suffer for model dependent solutions. Model independent trigonometric parallaxes have been rare. Space based trigonometric parallaxes are now available for a larger sample using the second data release of Gaia. We aim to derive a high quality approach for selection criteria of trigonometric parallaxes for planetary nebulae and discuss possible caveats and restrictions in the use of this data release. A few hundred sources from previous distance scale surveys were manually cross identified with data from the second Gaia data release (DR2) as coordinate based matching does not work reliable. The data are compared with the results of previous distance scales and to the results of a recent similar study, which was using the first data release Gaia DR1. While the few available previous ground based and HST trigonometric parallaxes match perfectly to the new data sets, older statistical distance scales, reaching larger distances, do show small systematic differences. Restricting to those central stars, were photometric colors of Gaia show a negligible contamination by the surrounding nebula, the difference is negligible for radio flux based statistical distances, while those derived from H-alpha surface brightness still show minor differences. The DR2 study significantly improves the previous recalibration of the statistical distance scales using DR1/TGAS. Description: The full table of manually verified targets in the second Gaia Data Release (Gaia DR2) with the identifiers of galactic planetary nebulae is given. The catalogue is not obtained with simple coordinate match, but by use of finding chats and also identifying the central stars by correct orders of magnitudes. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tablea.dat 109 382 Matched PN G vs Gaia DR2 identifications -------------------------------------------------------------------------------- See also: I/345 : Gaia DR2 (Gaia Collaboration, 2018) Byte-by-byte Description of file: tablea.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- PNG Simbad/IAU PN G identifier (LLL.l+BB.b) 13- 20 A8 --- --- [Gaia DR2] 22- 40 I19 --- Source Gaia DR2 identifier 42- 57 F16.12 deg RAdeg Gaia Right ascension (ICRS at epoch 2015.5) 60- 75 F16.12 deg DEdeg Gaia Declination (ICRS at epoch 2015.5) 76- 83 F8.4 mas plx ? Gaia parallax 85- 91 F7.4 mas e_plx ? Gaia formal parallax error 93- 99 F7.4 mag Gmag Gaia G magnitude 101-107 F7.4 mag BP-RP ? Gaia (BP-RP) color 109 A1 --- Remark Remark (1) -------------------------------------------------------------------------------- Note (1): Remarks as follows: A = bad magnitude match B = overly with very nearby red star C = secured ID of blue star despite large coordinate offset D = CSPN ID by Kwitter et al. (1988AJ.....96..997K) E = double star F = unusual extremely red target in 2MASS G = PHL 932 - most likely not a PN (Frew et al., 2013, Cat. J/MNRAS/431/2) H = authors claim in original discovery that it might be a field star I = newly identified CSPN due to color on sky surveys -------------------------------------------------------------------------------- Acknowledgements: Stefan Kimeswenger, Stefan.Kimeswenger(at)gmail.com ================================================================================ (End) Patricia Vannier [CDS] 27-Jul-2018