J/other/OEJV/230 Mira variables period changes in M16-M17 Region (Nesci+, 2022)
Period Changes of Mira Variables in the M16 - M17 Region.
Nesci R., Soszynski I., Tuvikene T.
<Open European J. Var. stars, 230, 1 (2022)>
=2022OEJV..230....1N 2022OEJV..230....1N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry ; Optical
Keywords: stars: AGB and post-AGB - stars: late type
Abstract:
We analyzed the light curves of 165 AGB variables, mostly Miras, in
the sky area centered between M16 and M17 (l=16, b=0), using the OGLE
GVS database in the IC band. Comparison with the published light
curves, derived about 50 years earlier by P. Maffei using Kodak I-N
photographic plates, allowed us to ifind no significant period changes
in any star. Remarkably, a few stars of the sample appear to have
substantially changed their average luminosity, the most striking case
being KZ Ser. We provide a better identification for three stars:
IX Ser, NSV 10522, and NSV 10326, all of them being Miras. We classify
the light curves of 6 stars, discovered but not classified by Maffei,
(GL Ser, NSV 10271, NSV 10326, NSV 10522, NSV 10677, and NSV 10772)
five of them being new Miras, and confirm the R CrB nature of
V391 Sct. The magnitude scale used by Maffei is compared to the modern
IC one.
Description:
Light curves for 165 Maffei's variables were found in the OGLE GVS
database, with a typical sampling for each star of about 100 points
over a 5-year time span, comparable to that of Maffei's light curves.
The photometric errors were usually smaller than 0.01mag. A few known
eclipsing variables were excluded, as well as a few very poorly
sampled stars, giving a final sample of 150 stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 165 Light curve parameters from OGLE data
table2.dat 61 11 Stars with discrepant periods
table3.dat 54 6 OGLE data for Maffei's unclassified stars
table4.dat 55 11 Stars with possible change of the average magnitude
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
11- 26 A16 --- 2MASS 2MASS ID (HHMMSSss+DDMMSSs)
28- 46 A19 --- OCVS OGLE ID
48- 51 A4 --- Maffei Maffei (1975IBVS..985....1M 1975IBVS..985....1M) ID
53- 57 F5.1 d Per Period
59- 61 F3.1 d e_Per Period error
63- 67 I5 d T0 Epoch (MJD)
69- 72 F4.1 mag Magmax Maximun magnitude
74- 77 F4.1 mag Magmin Minimun magnitude
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
11- 14 A4 --- Maffei Maffei ID
16- 34 A19 --- OGLE OGLE ID
36- 38 A3 --- Class Maffei's classification
40- 42 I3 d PMaffei Maffei's period
43 A1 --- u_PMaffei Uncertainty flag on Maffei's period
45- 49 F5.1 d POGLE OGLE period
51- 54 F4.2 d e_POGLE OGLE period error
56- 61 F6.3 --- DP/P Ratio of the periods difference to the
OGLE period
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
11- 14 A4 --- Maffei Maffei ID
16- 35 A20 --- OGLE OGLE ID
36- 38 I3 d Per Period
40- 43 F4.2 mag Amp Amplitude of variation
45- 49 F5.2 mag Icmag Mean IC magnitude
51- 54 A4 --- Class Classification
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name
11- 29 A19 --- OGLE OGLE name
31- 34 A4 --- Maffei Maffei ID
36- 40 F5.2 mag Imag OGLE I magnitude
42- 46 F5.1 d Per Period
48- 52 F5.2 mag DI Amplitude in I magnitude
54- 55 I2 --- N Number of plates
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Sep-2022