UVBY photometry of blue stragglers in NGC 7789

Twarog, Bruce A.; Tyson, Neil De Grasse

doi:10.1086/113833

Cited by 15 publications

(17 citation statements)

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“…(d) Averages of measurements by Racine (1971), Barbaro & Pigatto (1984), Vandenberg (1985), Nissen et al (1987), Hobbs & Thorburn (1991), Gilliland & Brown (1992), Demarque et al (1992), Meynet et al (1993), Montgomery et al (1993), Carraro & Chiosi (1994), Dinescu et al (1995), Fan et al (1996), Twarog et al (1997), Sarajedini (1999), Tadross et al (2002), Grocholski & Sarajedini (2003), VandenBerg & Clem (2003), Laugalys et al (2004), andSandquist (2004). (e) Averages of measurements by Burbidge & Sandage (1958), Arp (1962), Strom & Strom (1970), Jennens & Helfer (1975), Janes (1977), Claria (1979), Twarog & Tyson (1985), Lyngå (1987), Mazzei & Pigatto (1988), Friel & Janes (1993), Martinez Roger et al (1994, Janes & Phelps (1994), Twarog et al (1997), Gim et al (1998b), Sarajedini (1999), Vallenari et al (2000), Tadross et al (2002), and Bartašiutė & Tautvaišienė (2004).…”

Section: Linelist Atomic Data and Equivalent Widthsmentioning

confidence: 99%

“…NGC 7789 (α J2000 = 23:57:24 and δ J2000 = +56:42:30, or l = 115.53 and b = −5.39) is a rich and intermediate-age OC, with a clearly defined giant branch, a well-populated mainsequence turnoff, and a substantial population of blue stragglers (McNamara 1980;Twarog & Tyson 1985;Milone & Latham 1994). Several photometric studies have been carried out (some examples are Kustner 1923;Reddish 1954;Burbidge & Sandage 1958;Janes 1977;Martinez Roger et al 1994;Jahn et al 1995;Gim et al 1998a;Vallenari et al 2000;Bartašiutė & Tautvaišienė 2004;Bramich et al 2005) and its parameters are reasonably well known.…”

Section: Ngc 7789mentioning

confidence: 99%

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Chemical abundance analysis of the open clusters Cr 110, NGC 2099 (M 37), NGC 2420, NGC 7789, and M 67 (NGC 2682)

Pancino

Carrera

Rossetti

et al. 2010

A&A

194

207

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Context. The present number of Galactic Open Clusters that have high resolution abundance determinations, not only of [Fe/H], but also of other key elements, is largely insufficient to enable a clear modeling of the Galactic Disk chemical evolution. Aims. To increase the number of Galactic Open Clusters with high quality measurements. Methods. We obtained high resolution (R∼30 000), high quality (S/N∼50-100 per pixel), echelle spectra with the fiber spectrograph FOCES, at Calar Alto, Spain, for three red clump stars in each of five Open Clusters. We used the classical Equivalent Width analysis method to obtain accurate abundances of sixteen elements: Al,

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Section: Linelist Atomic Data and Equivalent Widthsmentioning

confidence: 99%

Section: Ngc 7789mentioning

confidence: 99%

Chemical abundance analysis of the open clusters Cr 110, NGC 2099 (M 37), NGC 2420, NGC 7789, and M 67 (NGC 2682)

Pancino

Carrera

Rossetti

et al. 2010

A&A

194

207

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“…The colour indices used are presented in Table 2. They were dereddened using the value E B−V = 0.28, which is an average of results obtained in 10 studies (Burbidge & Sandage 1958;Arp 1962;Strom & Strom 1970;Jennens & Helfer 1975;Janes 1977;Clariá 1979;Twarog & Tyson 1985;Martinez Roger et al 1994; Gim et al 1998b;Vallenari et al 2000). Afterwards all temperatures were checked so that equal abundance results would be obtained from lines of different excitation potentials.…”

Section: Atmospheric Parameters and Abundancesmentioning

confidence: 99%

Chemical composition of evolved stars in the open cluster NGC 7789

Tautvaišienė¹,

Edvardsson

Puzeras³

et al. 2005

A&A

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Abstract. High-resolution spectra of six giants and three core-helium-burning "clump" stars in the open cluster NGC 7789 have been obtained with the SOFIN spectrograph on the Nordic Optical Telescope to investigate abundances of up to 20 chemical elements. Abundances of carbon were studied using the C 2 Swan (0, 1) band head at 5635.5 Å. The wavelength interval 7980-8130 Å with strong CN features was analysed in order to determine nitrogen abundances and 12 C/ 13 C isotope ratios. The oxygen abundances were determined from the [O I] line at 6300 Å. The overall metallicity of evolved stars in the cluster was found to be close to solar ([Fe/H] = −0.04 ± 0.05). Compared with the Sun and other dwarf stars of the Galactic disk, mean abundances in the investigated giant stars suggest that carbon is depleted by about 0.2 dex, and nitrogen and oxygen are close to solar. In the clump stars investigated, carbon is depleted by about 0.2 dex, the mean abundance of nitrogen is enhanced by 0.26 dex and oxygen is lower by 0.14 dex. This has the effect of lowering the mean C/N ratios to the value of 1.9 ± 0.5 in the giant stars and to the value of 1.3 ± 0.2 in the clump stars. The mean 12 C/ 13 C ratios are lowered to about the same value of 9 ± 1 in the giants and clump stars investigated. Concerning other chemical elements an overabundance of sodium is noticeable and of silicon and calcium one is suspected. Abundances of iron-group and heavier chemical elements in all nine stars were found to be close to solar.

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“…Photometry, polarimetry and proper motion: Pendl (1975), McNamara (1980, Twarog & Tyson (1985), Manteiga et al (1991), Breger (1982. Radial velocities: Strom & Strom (1970), Stryker & Hrivnak (1984), Drilling & Schönberner (1987), Manteiga et al (1989), Milone & Latham (1994).…”

Section: Cluster Membershipmentioning

confidence: 99%

Blue stragglers in open clusters

Schönberner

Andrievsky

Drilling

2001

A&A

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Abstract. We performed for the first time a detailed LTE spectroscopic study of a sample of blue straggler stars in the moderately old open cluster NGC 7789. For eight stars the parameters and abundances of several elements were determined. The cluster members show a remarkable surface magnesium deficiency which is quite unusual for late B -early A stars. Iron and titanium abundances are in agreement with other photometric and spectroscopic estimates of the NGC 7789 metallicity. All the confirmed blue stragglers have rather low projected rotational velocities (with one exception for K88, v sin i = 80 km s −1 ).

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UVBY photometry of blue stragglers in NGC 7789

Cited by 15 publications

References 0 publications

Chemical abundance analysis of the open clusters Cr 110, NGC 2099 (M 37), NGC 2420, NGC 7789, and M 67 (NGC 2682)

Chemical abundance analysis of the open clusters Cr 110, NGC 2099 (M 37), NGC 2420, NGC 7789, and M 67 (NGC 2682)

Chemical composition of evolved stars in the open cluster NGC 7789

Blue stragglers in open clusters

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