Comparison of U BV R photometry of giant HII regions in the galaxy NGC 628 with a detailed grid of evolutionary models for star clusters

Bruevich, V. V.; Гусев, А. С.; Ezhkova, O. V.; Сахибов, Ф. Х.; Смирнов, М. А.

doi:10.1134/s1063772907030043

Cited by 10 publications

(16 citation statements)

References 14 publications

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“…The results of U BVRI photometry for NGC 628 have already been published in Bruevich et al (2007). Here we present Hα spectrophotometric observations and data reduction for the galaxy, that have not been published earlier.…”

Section: Observations and Reductionmentioning

confidence: 91%

“…The main image reduction stages for spectrophotometric data were as follows: correction for bias and flat field; removal of cosmic-ray traces; determining the sky background, then subtracting it from each image frame; aligning and adding the images; absolute calibration. The main photometric U BVRI image reduction stages were described in detail in Bruevich et al (2007).…”

Section: Data Reductionmentioning

confidence: 99%

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Regular chains of star formation complexes in spiral arms of NGC 628

Гусев¹,

Efremov²

2013

Monthly Notices of the Royal Astronomical Society

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We investigate photometric properties of spiral arms and stellar complexes/associations inside these arms in the grand design NGC 628 (M 74) galaxy. We analyze GALEX ultraviolet, optical U BVRI, and Hα surface photometry data, including those obtained with 1.5 m telescope at the Maidanak Observatory. In the longer arm, the large and bright stellar complexes are located at regular intervals along the arm, but only farther from the galaxy center. They are joined with the narrow lane of dust, visible only in the infrared bands. The usual dust lane along the stellar arm inner side is seen there only at distances closer to the galaxy center. It is well expressed in CO (H 2 ) image. We have found, that the second, short arm hosts two dust lanes, the strong and wide at the inner side, and narrow and irregular along its outer edge. This outer dust lane is well seen in IR images only. The shorter arm contains no star complexes at all. Gradients of age and luminosity of stars across both arms are missing (again excepting the parts of arms located closer to the center), which is confirmed by our photometric cuts across both arms. The drastic difference in the morphology of the two symmetric arms (grand design type) of a galaxy has now been confirmed by objective measurements in the case of M 74. It is unclear why about two third of galaxies with beaded arms host these "beads" (star complexes) in one arm only.

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Section: Observations and Reductionmentioning

confidence: 91%

Section: Data Reductionmentioning

confidence: 99%

Regular chains of star formation complexes in spiral arms of NGC 628

Гусев¹,

Efremov²

2013

Monthly Notices of the Royal Astronomical Society

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“…We selected galaxies with known UBVRI photometry of H ii regions, as obtained by our team in previous works: NGC 628 (Bruevich et al ), NGC 783 (Gusev ,b), NGC 2336 (Gusev & Park ), NGC 6217 (Artamonov et al ), NGC 7331 (unpublished) and NGC 7678 (Artamonov, Bruevich & Gusev ). The galaxy sample is presented in Table .…”

Section: Observations and Reductionmentioning

confidence: 99%

Oxygen and nitrogen abundances of H iiregions in six spiral galaxies

Гусев

Pilyugin

Сахибов

et al. 2012

Monthly Notices of the Royal Astronomical Society

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Spectroscopic observations of 63 H ii regions in six spiral galaxies (NGC 628, NGC 783, NGC 2336, NGC 6217, NGC 7331 and NGC 7678) were carried out with the 6‐m telescope (BTA) of Russian Special Astrophysical Observatory with the Spectral Camera attached to the focal reducer SCORPIO in multislit mode with a dispersion of 2.1 Å pixel−1 and a spectral resolution of 10 Å. These observations were used to estimate the oxygen and nitrogen abundances and the electron temperatures in H ii regions through the recent variant of the strong‐line method (NS calibration). The parameters of the radial distribution (the extrapolated central intercept value and the gradient) of the oxygen and nitrogen abundances in the discs of spiral galaxies NGC 628, NGC 783, NGC 2336, NGC 7331 and NGC 7678 have been determined. The abundances in NGC 783, NGC 2336, NGC 6217 and NGC 7678 are measured for the first time. Galaxies from our sample follow well the general trend in the luminosity–central metallicity diagram for spiral and irregular galaxies.

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“…The subsequent reduction and calibration of the data were carried out using standard procedures in the ESO-MIDAS image-reduction system, described in detail, for example, in Bruevich et al (2007Bruevich et al ( , 2010.…”

Section: Galaxy Samplementioning

confidence: 99%

Studies of the stellar populations of galaxies using two-color diagrams

Гусев¹,

Guslyakova

Novikova³

et al. 2015

Astron. Rep.

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Variations in the photometric parameters of stellar systems as a function of their evolution and the stellar populations comprising them are investigated. A set of seven evolutionary models with an exponential decrease in the star-formation rate and 672 models with a secondary burst of star formation are considered. The occurrence of a secondary burst of star formation can shift the position of a stellar system on two-color diagrams to the right or left of the normal color sequence for galaxies and the extinction line. This makes it possible to estimate the composition of the stellar population of a galaxy with a nonmonotonic star formation history from its position on two-color diagrams. Surface photometry in both the optical (UBVRI) and near-IR (JHK) is used to study the stellar populations and star-formation histories in the structural components (nucleus, bulge, disk, spiral arms, bar, ring) of 26 galaxies of various morphological types (from S0 to Sd). Components (nucleus, bulge, bar) with color characteristics corresponding to stellar systems with secondary bursts of star formation are indicated in 10 of the 26 galaxies. The parameters of these secondary bursts are estimated. Five of the 10 galaxies with complex star-formation histories display clear structural perturbations. Appreciable differences in the photometric characteristics of relatively red early-type galaxies (S0-Sb) and relatively blue later-type galaxies (Sb-Sd) have been found. Galaxies of both early and late types are encountered among the Sb-galaxies. Lenticular galaxies do not display different photometric characteristics from early-type spiral galaxies.Comment: Slightly edited version of the paper published in the Astronomy Reports, 2015, 59, 899. 18 pages (21 pp. in original paper), 11 figures, 3 table

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Comparison of U BV R photometry of giant HII regions in the galaxy NGC 628 with a detailed grid of evolutionary models for star clusters

Cited by 10 publications

References 14 publications

Regular chains of star formation complexes in spiral arms of NGC 628

Regular chains of star formation complexes in spiral arms of NGC 628

Oxygen and nitrogen abundances of H iiregions in six spiral galaxies

Studies of the stellar populations of galaxies using two-color diagrams

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