CCD photometry of the globular cluster M92 in the Vilnius photometric system. Eastern area

Smriglio, F.; Kazlauskas, A.; Dasgupta, A. K.; Straižys, V.; Boyle, R. P.

doi:10.1515/astro-1998-0303

Cited by 2 publications

(6 citation statements)

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“…6c to show the fairly good sequence of the MD stars more clearly. This sequence, as already shown by Smriglio et al (1998), displays a good fit with the sequence of a sample of field stars, with same metallicity and luminosity and after dereddening of their color indices. Again in this figure, six suspected foreground stars of solar metallicity and two suspected RHB stars are present, as their measured metallicity afterwards confirmed.…”

Section: The Photometric Determination Of [Fe/h] Ratiosupporting

confidence: 77%

“…According to this author, in the case Sandage (1970) 0.02 Harris & Racine (1979) 0.01 Zinn (1980a) 0.02 Zinn (1985) 0.02 Reed et al (1988) 0.02 Smriglio et al (1998) 0.01 Sandage (1969) and the same color-index observed by Sandage & Walker (1966) for 17 stars.…”

Section: Interstellar Extinctionsupporting

confidence: 64%

“…But considering the poor quality of the standards and of the high surface density of stars around the globular cluster, these results are acceptable. On the other hand, as we have already suggested in a previous paper (Smriglio et al 1998), it is not excluded that the available broad band photometry can contain systematic errors. For testing this hypothesis, we identified a number of stars common to two different photoelectric observations in this region (see Table A.6 in Appendix), published by Sandage & Walker (1966) and Sandage (1969).…”

Section: Reductionsmentioning

confidence: 80%

“…Both Harris & Racine (1979) and Zinn (1980a) have taken weighted means of the available reddening estimates in the literature and, while these averages are identical, they found differences of up to 0.03 mag for many clusters on their list. The reddening has been measured recently by Vilnius photometry (Smriglio et al 1998) using seven suspected non-member foreground stars (Sandage & Walker 1966) of solar metallicity. The metal abundance of these stars is also confirmed by the color-color diagrams in the VPS.…”

Section: Fig 4 Comparison Between the (B − V) Color-index Bymentioning

confidence: 99%

“…We had several aims in view: e.g., automated photometric classification of a wide variety of stars (Smriglio et al 1986(Smriglio et al , 1988(Smriglio et al , 1990, CCD photometry in the Vilnius photometric system (Boyle et al 1990a,b;Boyle et al 1994;Dodd et al 1996;Boyle et al 1998;Smriglio et al 1998;Smriglio et al 2002), determination of interstellar extinction (Smriglio et al 1991;Boyle et al 1992;Janulis & Smriglio 1992), and the study of the cloudy structure of interstellar dust and the gas-to-dust ratio Smriglio et al 1995;Smriglio et al 1996). The observations of globular clusters give the opportunity of calibrating photometric systems in terms of temperature, luminosity, and metallicity, since these parameters, and the interstellar reddening of the cluster stars can be measured with rather good accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Photometric determination of the [Fe/H] ratio for the globular cluster M 92

Smriglio¹,

Dasgupta²,

Boyle

2006

A&A

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CCD observations of the northern globular cluster M 92 were obtained in the PXYVS colors of the Vilnius photometric system. The results for 230 stars in an area centered on the cluster and for 178 stars in an area west of the cluster down to V = 17.0 mag are presented. After a brief outline of the data pathway from observations to reduction via IRAF and a discussion of the photometric errors, the [Fe/H] ratio of the globular cluster M 92 is determined by multicolor PXYVS Vilnius photometry.

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Section: The Photometric Determination Of [Fe/h] Ratiosupporting

confidence: 77%

Section: Interstellar Extinctionsupporting

confidence: 64%

Section: Reductionsmentioning

confidence: 80%

Section: Fig 4 Comparison Between the (B − V) Color-index Bymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Photometric determination of the [Fe/H] ratio for the globular cluster M 92

Smriglio¹,

Dasgupta²,

Boyle

2006

A&A

Self Cite

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The search for roAp stars: null results and new candidates from Strömgren-Crawford photometry

Paunzen¹,

Handler

Hoňková

et al. 2018

Res. Astron. Astrophys.

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The rapidly oscillating Ap (roAp) stars exhibit pulsational photometric and/or radial velocity variations on time scales of several minutes, which are essential to test current pulsation models as well as our assumptions of atmospheric structure characteristics. In addition, their chemical peculiarity makes them very interesting for probing stellar formation and evolution in the presence of a global magnetic field. To date, a limited number of only 61 roAp stars are known to show photometric variability. On the other hand, a literature survey yields 619 unique stars that have unsuccessfully been searched for variability of this kind. Strömgren-Crawford uvbybeta photometry of stars from both subgroups were used to investigate whether there is a selection bias of the investigated stars. We also present new photometric measurements (202 hours in 59 different nights) of 55 roAp candidates. We did not detect any new roAp star. Although our detection limits are comparable to other surveys, we also did not find pulsations in the known roAp star HD 12098, which may be a consequence of temporal amplitude changes. On the other hand, we do find some evidence for photometric variability of beta CrB at its spectroscopically derived pulsation period. From the uvbybeta photometry we conclude that the blue border of the roAp instability strip appears observationally well defined, whereas the red border is rather poorly known and studied. Within these boundaries, a total of 4646 candidates were identified which appear worthwhile to be investigated for short-term pulsational variability.

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CCD photometry of the globular cluster M92 in the Vilnius photometric system. Eastern area

Cited by 2 publications

References 0 publications

Photometric determination of the [Fe/H] ratio for the globular cluster M 92

Photometric determination of the [Fe/H] ratio for the globular cluster M 92

The search for roAp stars: null results and new candidates from Strömgren-Crawford photometry

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