J/A+A/656/A110 Gaia EDR3 planetary nebula central star distances (Chornay+ 2021)
One star, two star, red star, blue star: an updated planetary nebula central
star distance catalogue from Gaia EDR3.
Chornay N., Walton N.A.
<Astron. Astrophys. 656, A110 (2021)>
=2021A&A...656A.110C 2021A&A...656A.110C (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Photometry ; Optical ;
Parallaxes, trigonometric
Keywords: planetary nebulae: general - parallaxes - methods: statistical
Abstract:
Planetary nebulae (PNe) are a brief but important phase of stellar
evolution. The study of Galactic PNe has historically been hampered by
uncertain distances, but the parallaxes of PN central stars (CSPNe)
measured by Gaia are improving the situation.
Gaia's Early Data Release 3 (EDR3) offers higher astrometric precision
and greater completeness compared to previous releases. Taking
advantage of these improvements requires that the CSPNe in the
catalogue be accurately identified.
We applied our automated technique based on the likelihood ratio
method to cross-match known PNe with sources in Gaia EDR3, using an
empirically derived position and colour distribution to score
candidate matches.
We present a catalogue of over 2000 sources in Gaia EDR3 that our
method has identified as likely CSPNe or compact nebula detections. We
show how the more precise parallaxes of these sources compare to
previous PN statistical distances and introduce an approach to
combining them to produce tighter distance constraints. We also
discuss Gaia's handling of close companions and bright nebulae.
Gaia is unlocking new avenues for the study of PNe. The catalogue
presented here will remain valid for the upcoming Gaia Data Release 3
(DR3) and thus provide a valuable resource for years to come.
Description:
The full best matches catalogue (Table A.1) is given, containing the
highest reliability matches from Gaia EDR3 for all true, likely, and
possible PNe in HASH (as of 5 July 2021), for which the reliability is
at least 0.2 (our threshold for a possible match). The table contains
columns copied from the Gaia EDR3 catalogue and from HASH are that are
particularly relevant to the matching. It also contains Bayesian
distance estimates derived using the statistical distances of Frew et
al. (2016MNRAS.455.1459F 2016MNRAS.455.1459F) as a prior.
It is important to treat the matches that we provide probabilistically
and appropriately in context. The reliability should be used as a
filter to limit analysis to matches with sufficiently high confidence
(e.g. reliability >0.8), with the particular threshold depending on
the application. There is a great deal of additional information not
used in our matching, such as source magnitude and parallax, that can
help to disambiguate uncertain cases. For example, if a candidate
source has a precise parallax that strongly disagrees with other
reliable distance measures or leads to an implausible physical nebula
size, that adds weight to the source in fact being coincidental,
especially in the absence of strong evidence from other non-positional
features such as colour.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 370 2117 Best matches catalogue
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/638/A103 : Planetary nebulae central stars in Gaia DR2 (Chornay+, 2020)
http://202.189.117.101:8999/gpne/index.php : HASH Home Page
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- PNG PN G identifier (from HASH),
except for J16 (Jacoby SMC 16) (1)
13- 43 A31 --- Name ? PN name (from HASH)
45- 63 I19 --- GaiaEDR3 Gaia EDR3 source identifier
65- 85 F21.17 deg RAdeg Gaia Right ascension (ICRS) at Ep=2016.0
87-108 F22.18 deg DEdeg Gaia Declination (ICRS) at Ep=2016.0
110-128 F19.17 --- Rel [0/1] Reliability of match (2)
130-150 F21.18 arcsec Sep Separation between Gaia and PN position
152-173 F22.19 mag BP-RP ? Gaia (BP-RP) colour
175-192 F18.15 mag Gmag ? Gaia G magnitude
194-216 E23.15 mas plx ? Gaia parallax
218-237 F20.18 mas e_plx ? Gaia parallax error
239-257 F19.16 --- RUWE ? Gaia renormalised unit weight error
259-277 F19.15 deg pnRAdeg PN Right ascension (ICRS, J2000) (from HASH)
279-297 F19.15 deg pnDEdeg PN Declination (ICRS, J2000) (from HASH)
299-305 F7.2 arcsec pnRad ? PN radius (from HASH) (3)
307 A1 --- pnStat [TLP] PN confirmation status (from HASH) (4)
309-328 F20.14 pc rcomb ? Median of the combined (parallax and
statistical) distance posterior
330-349 F20.14 pc b_rcomb ? 16th percentile of the combined (parallax
and statistical) distance posterior
351-370 F20.14 pc B_rcomb ? 84th percentile of the combined (parallax
and statistical) distance posterior
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Note (1): Formatted as LLL.l+BB.b with a few exceptions. Identifiers taken from
HASH and may differ slightly from galactic coordinates of PN.
Note (2): Probability of match being correct, determined by our method using
source colour and position. We consider candidate sources with
reliability > 0.8 to be good matches and those with reliability
between 0.2 and 0.8 to be uncertain. Only the single highest
reliability candidate match is included for each PN, and candidates
with reliability below 0.2 are excluded altogether.
Note (3): PN radii are taken to be half of the Major Diameter in HASH.
Note (4): PN confirmation status (from HASH):
T = True PN
L = Likely PN
P = Possible PN
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Acknowledgements:
Nicholas Chornay, njc89(at)cam.ac.uk
(End) Patricia Vannier [CDS] 16-Oct-2021