Photometry of the Rubin Losee blue stars at the anticenter

Philip, A. G. D.; Chromey, F. R.; Dubois, P.

doi:10.1086/132687

Cited by 4 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also shown are the theoretical spectra (bold smooth curves) which have been calculated using the atmospheric parameters in Table 3 and the abundances in Table 4. Good agreement is found between theory and observation calculated by Philip et al (1990) by using an absolutemagnitude -spectral type relation is significantly different to our estimate of 4.6 kpc. The absolute magnitude used by Philip et al of M v = −3.58 may be an over-estimate as our model atmospheric analysis indicates that this star is close to the ZAMS, and hence a lower intrinsic luminosity is probably more appropriate.…”

Section: Distance Estimates and Cluster Membershipcontrasting

confidence: 94%

“…The photometry indicated that these are OB main-sequence stars with similar atmospheric parameters and spectral types between 09.5 and B1. The two RLWT stars were selected from a list of 14 targets studied photometrically by Philip et al (1990), who confirmed their classification as early-type main-sequence B-stars at large anti-centre distances. The photometric data are contained in Table 1 together with those for the star S285-6, which has been studied previously by Rolleston et al (1994).…”

Section: Observational Datamentioning

confidence: 99%

See 1 more Smart Citation

The chemical composition towards the Galactic anti-centre. I. Observations and model atmosphere analyses

Smartt¹,

Dufton²,

Rolleston³

1996

Astron. Astrophys. Suppl. Ser.

View full text Add to dashboard Cite

Abstract. -High resolution spectra of six early B-type main-sequence stars having galactocentric distances of between 10 and 18 kpc are presented. We list the equivalent widths for the metal lines and illustrate their hydrogen and helium line profiles. The stars are analysed using LTE line-blanketed model atmosphere techniques to derive atmospheric parameters and surface chemical compositions. All six stars have similar effective temperatures and surface gravities, allowing a reliable comparison of their metal abundances and distances. Significant variations in the photospheric abundances are evident and we discuss the need for a more detailed line-by-line differential analysis to exactly quantify the differences. This will be presented in a companion paper (Smartt et al. 1996).

show abstract

Section: Distance Estimates and Cluster Membershipcontrasting

confidence: 94%

Section: Observational Datamentioning

confidence: 99%

The chemical composition towards the Galactic anti-centre. I. Observations and model atmosphere analyses

Smartt¹,

Dufton²,

Rolleston³

1996

Astron. Astrophys. Suppl. Ser.

View full text Add to dashboard Cite

show abstract

“…(1) Moffat & Vogt (1975), (2) Fitzgerald et al (1976), (3) Jackson et al (1977), (4) Moffat et al (1979), (5) Fitzgerald & Moffat (1980), (6) Blitz et al (1982), ( 7) Babu (1983), ( 8) Lahulla (1987), ( 9) Philip et al (1990), (10) Fich & Silkey (1991), ( 11) Fitzsimmons (1993), ( 12) Turbide & Moffat (1993), ( 13) Rolleston et al (1994), ( 14) Smartt et al (1996a), ( 15) Perryman et al (1997), ( 16) Hensberge et al (2000), ( 17) Rolleston et al (2000), ( 18) Moreno-Corral et al (2002), ( 19) Park & Sung (2002), (20) Daflon & Cunha (2004), ( 21 The distribution of the stars' abundances according to their projected Galactocentric distances is shown in Fig. 12, where the left and right panels show the results for oxygen and silicon, respectively, for the outer disk stars (red circles) and nearby stars (blue triangles).…”

Section: Radial Abundance Gradientsmentioning

confidence: 99%

Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB stars

Bragança

Daflon

Lanz

et al. 2019

A&A

View full text Add to dashboard Cite

Context. Elemental abundance gradients in galactic disks are important constraints for models of how spiral galaxies form and evolve. However, the abundance structure of the outer disk region of the Milky Way is poorly known, which hampers our understanding of the spiral galaxy that is closest to us and that can be studied in greatest detail. Young OB stars are good tracers of the present-day chemical abundance distribution of a stellar population and because of their high luminosities they can easily be observed at large distances, making them suitable to explore and map the abundance structure and gradients in the outer regions of the Galactic disk. Aims. Using a sample of 31 main-sequence OB stars located between galactocentric distances 8.4 − 15.6 kpc, we aim to probe the present-day radial abundance gradients of the Galactic disk. Methods. The analysis is based on high-resolution spectra obtained with the MIKE spectrograph on the Magellan Clay 6.5-m telescope on Las Campanas. We used a non-NLTE analysis in a self-consistent semi-automatic routine based on TLUSTY and SYNSPEC to determine atmospheric parameters and chemical abundances. Results. Stellar parameters (effective temperature, surface gravity, projected rotational velocity, microturbulence, and macroturbulence) and silicon and oxygen abundances are presented for 28 stars located beyond 9 kpc from the Galactic centre plus three stars in the solar neighborhood. The stars of our sample are mostly on the main-sequence, with effective temperatures between 20 800 − 31 300 K, and surface gravities between 3.23 − 4.45 dex. The radial oxygen and silicon abundance gradients are negative and have slopes of −0.07 dex/kpc and −0.09 dex/kpc, respectively, in the region 8.4 ≤ R G ≤ 15.6 kpc. Conclusions. The obtained gradients are compatible with the present-day oxygen and silicon abundances measured in the solar neighborhood and are consistent with radial metallicity gradients predicted by chemodynamical models of Galaxy Evolution for a subsample of young stars located close to the Galactic plane.

show abstract

The Tables

Mermilliod

1994

Catalogue of Mean UBV Data on Stars

View full text Add to dashboard Cite

Photometry of the Rubin Losee blue stars at the anticenter

Abstract: Three-color (UBV) and four-color (uvby) observations of 14 Rubin and Losee stars in the anticenter region of the Milky Way Galaxy confirm their classification as normal, Population I B stars at distances of up to 10 kpc from the solar position.

Cited by 4 publications

References 3 publications

The chemical composition towards the Galactic anti-centre. I. Observations and model atmosphere analyses

The chemical composition towards the Galactic anti-centre. I. Observations and model atmosphere analyses

Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB stars

The Tables

Contact Info

Product

Resources

About