Spectral Classification in Some Open Clusters.

Svolopoulos, S. N.

doi:10.1086/147183

Cited by 12 publications

(10 citation statements)

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“…The photometric indices suggest that these stars are subgiants. Our results support the spectral classification of Svolopoulos (1961) for the star # 4 (B3 IV). We estimated the extra reddening due to circumstellar matter around Be-stars using the calibrations of Fabregat & Torrejon (1998).…”

Section: Resultssupporting

confidence: 89%

Discovery of New Be Stars in the Galactic Open Cluster NGC7128

Balog

Vinkó

Fürész

et al. 2000

International Astronomical Union Colloquium

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We present medium resolution spectroscopy (λ/Δλ ≈ 7,000) covering 6500-6750 Å of three emission stars in the highly reddened young open cluster NGC7128. Two of them were previously unknown. The known Be star (V1814 Cyg) is an irregular variable; one of the newly discovered stars is an eclipsing binary (V1481 Cyg) (Jerzykiewicz et al., 1996.). Physical parameters of the cluster have been determined from new UBV and uvbyHβ photometric measurements.

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Section: Resultssupporting

confidence: 89%

Discovery of New Be Stars in the Galactic Open Cluster NGC7128

Balog

Vinkó

Fürész

et al. 2000

International Astronomical Union Colloquium

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“…′ × 21 ′ . A log of observations is given in Table (2) (1) Kharchenko et al (2009), (2) This study, (3) Kharchenko et al (2005), (4) Maciejewski & Niedzielski (2007), ( 5) Svolopoulos (1961), (6) Hoag et al (1961), ( 7) Lindoff (1968), (8) Hassan & Barbon (1973), (9) Kopchev & Petrov (2008), (10) Zelwanowa & Schöneich (1972), ( 11) Hassan (1973), ( 12) Schneider (1987), ( 13) Hassan (1967), ( 14) Rosvick & Robb (2006) 2. During the observations, we used different exposure times in order to obtain the widest possible flux range in three different bands: U , B, and V .…”

Section: Observationsmentioning

confidence: 99%

CCD UBV photometric and Gaia astrometric study of eight open clusters- ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21

Yontan,

Bilir,

Bostanci

et al. 2019

Preprint

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In this study, we carried out CCD UBV photometry of eight open clusters, ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1, Stock 21, and determined their reddening, metallicity, distance, age, and mass functions. We used new Gaia Data Release 2 (DR2) astrometric data to separate cluster member stars from the field stars and obtain precise structural and astrophysical parameters. To identify cluster member stars we utilized an unsupervised membership assignment code (UPMASK), which is based on the photometric and astrometric data. The density distributions for the open clusters show good fits with the empirical King model except for Roslund 1 and Stock 21 not having central concentration. The colour excesses and metallicities were derived separately using U − B × B − V two-colour diagrams. Keeping these parameters as constants, we simultaneously calculated distance moduli and ages of the clusters from V × B − V and V × U − B colour-magnitude diagrams using PARSEC theoretical isochrones. Taking into account Gaia DR2 proper motion components and parallaxes of the member stars, we also calculated mean proper motions and distances for the clusters. Distances derived both from isochrone fitting to colour-magnitude diagrams of the clusters and Gaia DR2 trigonometric parallaxes are compatible with each other. Slopes of the mass functions of the eight open Istanbul, Turkey

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“…The finally adopted spectral types are listed in Table 3 together with the spectral type estimates of Hoag & Applequist (1965) and Svolopoulos (1961). Table 3 also gives the photometric data for these stars obtained from our calibrated photometry (Section 2).…”

Section: Spectroscopic Analysismentioning

confidence: 99%

Fundamental parameters and new variables of the galactic open cluster NGC 7128

Balog

Delgado

Moitinho

et al. 2001

Monthly Notices of the Royal Astronomical Society

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CCD photometry in Johnson UBV and Strömgren uvby systems and medium‐resolution spectroscopy of the galactic open cluster NGC 7128 are presented. Spectral types of the brightest 12 stars in the cluster field were determined based on equivalent widths of the Hα and the He i 6678‐Å line. The spectroscopic observations also revealed two obvious and one probable Be‐type stars showing Hα emission. The analysis of the photometric diagrams gave a colour excess of E(B−V)=1.03±0.06 mag, a distance modulus DM=13.0±0.2 mag and an age above 10 Myr. Time‐resolved photometric observations obtained on one night resulted in the detection of short time‐scale light variations of seven new and three already known variable stars in the cluster field.

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Spectral Classification in Some Open Clusters.

Cited by 12 publications

References 0 publications

Discovery of New Be Stars in the Galactic Open Cluster NGC7128

Discovery of New Be Stars in the Galactic Open Cluster NGC7128

CCD UBV photometric and Gaia astrometric study of eight open clusters- ASCC 115, Collinder 421, NGC 6793, NGC 7031, NGC 7039, NGC 7086, Roslund 1 and Stock 21

Fundamental parameters and new variables of the galactic open cluster NGC 7128

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