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471. Long-term (1984-2008) JHKLM photometry of stars
ID:
ivo://CDS.VizieR/J/AZh/88/34
Title:
Long-term (1984-2008) JHKLM photometry of stars
Short Name:
J/AZh/88/34
Date:
21 Oct 2021
Publisher:
CDS
Description:
Long-term (1984-2008) JHKLM photometry for 254 objects is presented. The observations were carried out in the standard JHKLM photometric system using an original method and a modern IR photometer designed and built at the Sternberg Astronomical Institute. Our program of studies included searches for and studies of relatively hot circumstellar dust envelopes.
472. Long-term monitoring of {gamma} Dor stars
ID:
ivo://CDS.VizieR/J/A+A/499/967
Title:
Long-term monitoring of {gamma} Dor stars
Short Name:
J/A+A/499/967
Date:
21 Oct 2021
Publisher:
CDS
Description:
gamma Dor stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the knowledge of these stars considerably. A selected group of gamma Dor stars and some candidates were observed with the Mercator telescope to find and/or confirm the periodicities in the light variations and to derive reliable amplitude ratios in different pass bands. A frequency analysis was performed on all new data obtained in the Geneva photometric system. In order to have more reliable and accurate frequencies, the new data were combined with similar data from the literature and with Hipparcos observations. A set of frequencies that minimized the residuals in a harmonic fit was searched for while allowing means and amplitudes to vary from one observation set to another.
473. Long-Term Multicolour Photometry of YSOs
ID:
ivo://CDS.VizieR/J/other/PASA/32.21
Title:
Long-Term Multicolour Photometry of YSOs
Short Name:
J/other/PASA/32.
Date:
21 Oct 2021
Publisher:
CDS
Description:
Results from long-term multicolour optical photometric observations of the pre-main sequence stars FHO 26, FHO 27, FHO 28, FHO 29, and V1929 Cyg collected during the period from 1997 June to 2014 December are presented. The objects are located in the dense molecular cloud L935, named 'Gulf of Mexico', in the field between the North America and Pelican nebulae. All stars from our study exhibit strong photometric variability in all optical passbands. Using our BVRI observations and data published by other authors, we tried to define the reasons for the observed brightness variations. The presented paper is a part of our long-term photometric study of the young stellar objects in the region of 'Gulf of Mexico'.
474. Long-term photometry of M3 RR Lyrae
ID:
ivo://CDS.VizieR/J/MNRAS/419/2173
Title:
Long-term photometry of M3 RR Lyrae
Short Name:
J/MNRAS/419/2173
Date:
21 Oct 2021
Publisher:
CDS
Description:
The period-change behaviour of 134 RR Lyrae stars in the globular cluster Messier 3 (M3) is investigated on the ~120yr time-base of the photometric observations. The mean period-change rates ({beta}~~0.01d/Myr) of the subsamples of variables exhibiting the most regular behaviour are in good agreement with theoretical expectations based on horizontal branch stellar evolution models. However, a large fraction of variables show period changes that contradict the evolutionary expectations.
475. Long-term photometry of pre-MS stars
ID:
ivo://CDS.VizieR/J/A+A/568/A49
Title:
Long-term photometry of pre-MS stars
Short Name:
J/A+A/568/A49
Date:
21 Oct 2021
Publisher:
CDS
Description:
To broaden the search and study stars in the early evolutionary phase, we investigated a sample of 17 pre-main sequence objects previously detected as either H{alpha} emission-line pre-main sequence stars or T Tauri variables located in the field of the North America/Pelican Nebula complex. Johnson-Cousins B, V, Rc, Ic magnitudes and mean color indices for the program stars are determined from more than 12400 measurements from archive photographic plates and from CCD data collected at 7 observatories covering the period of almost 60 years from 1954 up to 2013. We complemented previously rare insights on the photometry of the program stars and presented their photometric history, which for almost all program stars is the first long term photometric monitoring on a timescale of 6 decades. Eight program stars are found to be classical T Tauri stars of variability type II, while 6 program stars are weak-line T Tauri stars of variability type I. For the first time, periodicity is found for three stars: V1716 Cyg indicates a 4.15 day period, V2051 Cyg indicates a 384 day period, and V521 Cyg a period of 503 days.
476. Long-term photometry of Variables I.
ID:
ivo://CDS.VizieR/II/170
Title:
Long-term photometry of Variables I.
Short Name:
II/170
Date:
21 Oct 2021
Publisher:
CDS
Description:
This is the first catalogue of photometric data in the Stroemgren system obtained during the period October 1982 - September 1986. Full description can be found in ESO report SP 8. Since our goal is not absolute (all-sky) photometry, the observations should be used for differential photometry only. The mean values of the r.m.s. deviations of the differential measurements of comparison stars are around (from Table 5 of paper) ------------------------------------ System y b-y m1 c1 ------------------------------------ 1 0.0109 0.0088 0.0133 0.0136 4 0.0068 0.0057 0.0079 0.0118 5 0.0087 0.0070 0.0114 0.0114 6 0.0090 0.0078 0.0126 0.0132 7 0.0071 0.0033 0.0041 0.0065 ------------------------------------
477. Long-term photometry of Variables II
ID:
ivo://CDS.VizieR/II/188
Title:
Long-term photometry of Variables II
Short Name:
II/188
Date:
21 Oct 2021
Publisher:
CDS
Description:
The second catalogue of the LTPV programme contains photometric data obtained during the period October 1986 - September 1990. Full description can be found in ESO reports SP 8 and 12. The data presented here have been upgraded since the printing of catalogue ESO SR 12; a major change is the use of a quite different standard, namely the ESO SAT (Stroemgren Automatic Telescope) instrumental system has been used as standard. The instrumental systems 6 and 8 can be obtained by applying the following color matrices (see ESO SR 12, page 4, Eq. (3)), inverted (b-y , y , m1 , c1): SYSTEM 6 1.0518 0.0000 0.0000 0.0000 0.0094 1.0000 0.0000 0.0000 -0.1238 0.0000 1.1206 0.0000 0.0426 0.0000 0.0000 1.0352 SYSTEM 8 1.0476 0.0000 0.0000 0.0000 0.0384 1.0000 0.0000 0.0000 -0.0877 0.0000 1.0487 0.0000 -0.2657 0.0000 0.0000 0.9732 It also very easy to go back to the same standard as in ESO SR 8 by applying the transformations given in Table 3 of ESO SR 12 (page 3). Note that the faint star C7060 is not identified so far. The mean values of the r.m.s. deviations of the differential measurements of comparison stars are around (from Table 5 of paper) ------------------------------------ System y b-y m1 c1 ------------------------------------ 6 0.0069 0.0058 0.0122 0.0129 7 0.0064 0.0030 0.0039 0.0067 8 0.0068 0.0061 0.0110 0.0097 ------------------------------------
478. Long-term photometry of Variables III
ID:
ivo://CDS.VizieR/II/200
Title:
Long-term photometry of Variables III
Short Name:
II/200
Date:
21 Oct 2021
Publisher:
CDS
Description:
This is the third catalogue of photometric data in the Stroemgren system obtained during the period October 1990-January 1992 in the framework of the Long-Term Photometry of Variables (LTPV) program at the European Southern Observatory. All data have been obtained with the Danish 50-cm telescope. The mean values of the r.m.s. deviations of the differential measurements of comparison stars are around (from Table 4 of paper) ------------------------------ y b-y m1 c1 ------------------------------ 0.005 0.002 0.004 0.006 ------------------------------
479. Long-term photometry of Variables IV
ID:
ivo://CDS.VizieR/II/202
Title:
Long-term photometry of Variables IV
Short Name:
II/202
Date:
21 Oct 2021
Publisher:
CDS
Description:
This is the fourth catalogue of photometric data in the Stroemgren system obtained during the period June 18, 1992 - August 23, 1994 in the framework of the Long-Term Photometry of Variables (LTPV) program at the European Southern Observatory. Since our goal is not absolute (all-sky) photometry, the observations should be used for differential photometry only. The mean values of the r.m.s. deviations of the differential measurements of comparison stars are around (from Table 3 of paper) ------------------------------ y b-y m1 c1 ------------------------------ 0.005 0.002 0.004 0.007 ------------------------------
480. Low-amplitude variables in NGC 6791
ID:
ivo://CDS.VizieR/J/AJ/123/3460
Title:
Low-amplitude variables in NGC 6791
Short Name:
J/AJ/123/3460
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have undertaken a long-term project, the Planets in Stellar Clusters Extensive Search (PISCES), to search for transiting planets in open clusters. As our first target, we have chosen NGC 6791, a very old, populous, metal-rich cluster. We present the results of a test observing run at the F.L. Whipple Observatory's 1.2 m telescope, from 2001 July 6 to August 1. Our primary goal is to demonstrate the feasibility of obtaining the accuracy required for planetary-transit detection using image subtraction photometry on data collected with a 1 m class telescope. We present a catalog of 62 variable stars, 47 of them newly discovered, most with low-amplitude variability. Among those there are several BY Draconis type variables. We have also observed outbursts in the cataclysmic variables B7 and B8.