J/A+A/689/A189 RR Lyrae periods with PS1 and K2 (Forro+, 2024)
Validation of the RR Lyrae period determination in the Pan-STARRS PS1 3π
survey with K2.
Forro A., Molnar L., Plachy E., Juhasz A., Szabo R.
<Astron. Astrophys. 689, A189 (2024)>
=2024A&A...689A.189F 2024A&A...689A.189F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry ; Optical
Keywords: stars: statistics - stars: variables: RR Lyrae
Abstract:
The Pan-STARRS 3π survey has detected hundreds of thousands of
variable stars thanks to its coverage and 4-year time span, even
though the sampling of the light curves is relatively sparse. These
light curves contain only 10-15 detections in each of the 5 filters
(g,r,i,z,y). During the K2 mission, the Kepler space telescope
observed along the Ecliptic Plane with a high sampling frequency,
although only for about 80 days in each of its campaigns.Crossmatching
and investigating the RR Lyrae stars observed by both K2 and
Pan-STARRS can serve as a valuable tool to validate the classification
and period determination of the ground-based survey. We used the Sesar
et al. (2017AJ....153..204S 2017AJ....153..204S, Cat. J/AJ/153/204) catalog of RR Lyrae
stars detected by Pan-STARRS. After determining the overlap between
the stars observed by both Pan-STARRS and K2, we also considered the
Gaia DR3 SOS RR Lyrae catalog data for the list of these stars
wherever it was available. The frequencies of the light variations
were calculated by applying the Lomb-Scargle periodogram method on the
K2 light curves that were prepared with the autoEAP photometry. The
calculated frequencies of the stars then were compared with those
given in the (Sesar et al., 2017AJ....153..204S 2017AJ....153..204S, Cat. J/AJ/153/204)
catalog and the Gaia DR3 RR Lyrae catalog. We found that for the
majority of the stars, the classification (95.6%) and the frequency
determination (90.1%) of the Pan-STARRS RR Lyrae stars were consistent
within 0.03d-1 with those that we derived from the K2 autoEAP light
curves. For a significant subset of the sample, 7.4%, however, an
offset of 1 or 2d-1 was found in the frequencies. These are the
result of the sampling of the detections because Pan-STARRS
observations are affected by diurnal cycles, whereas Kepler carried
out measurements quasi-continuously. We found that RRc subtypes are
significantly more affected (25.3%) than RRab subtypes (3.7%) which is
most likely caused by RRc stars having less sharp light curve
features. Validation via space-based data will be important for future
ground- based surveys, as well.
Description:
The list of investigated RR Lyrae stars are provided in the table
along with their properties.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 106 1353 The main properties of the investigated
RR Lyrae variables
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See also:
J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)
J/AJ/153/204 : RR Lyrae stars from the PS1 3π survey (Sesar+, 2017)
J/A+A/674/A18 : Gaia DR3. The RR Lyrae sample (Clementini+, 2023)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension (J2000)
11- 19 F9.5 deg DEdeg Declination (J2000)
21- 29 I9 --- EPIC ID of the star in the EPIC catalog
(Huber et al., 2016ApJS..224....2H 2016ApJS..224....2H,
Cat. J/ApJS/224/2)
31- 49 I19 --- GaiaDR3 ? Gaia DR3 ID of the star
51- 54 A4 --- TypePS Pan-STARRS classification type given in the
Sesar et al. (2017AJ....153..204S 2017AJ....153..204S,
Cat. J/AJ/153/204) catalog
56- 59 A4 --- TypeK2 K2 classification determined by visual
inspection of the K2 light curves
61- 68 F8.6 1/d FreqPS Frequency of the star from the Sesar et al.
(2017AJ....153..204S 2017AJ....153..204S, Cat. J/AJ/153/204)
catalog
70- 75 F6.4 1/d FreqK2 Frequency of the star calculated from the
K2 light curves
77- 84 F8.6 1/d FreqGaia ? Frequency of the star in the Gaia RR Lyrae
catalog (Clementini et al.,
2023A&A...674A..18C 2023A&A...674A..18C, Cat. J/A+A/674/A18)
86- 91 F6.3 mag Kpmag Kp magnitude of the star from the EPIC
catalog (Huber et al.,
2016ApJS..224....2H 2016ApJS..224....2H, Cat. J/ApJS/224/2)
93- 97 F5.2 mag Flux averaged g-band magnitude from the Sesar
et al. (2017AJ....153..204S 2017AJ....153..204S,
Cat. J/AJ/153/204) catalog
99-106 A8 --- Status Result of the frequency comparison
(Alias, Match or Mismatch)
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Acknowledgements:
Adrienn Forro, forro.adrienn(at)csfk.org
(End) Patricia Vannier [CDS] 12-Jul-2024