Search Results - "Danford, S"

Pulsational activity changes in the Cepheid Polaris (α UMi) during 2017–2018: a new amplitude decrease by Usenko, I A, Kovtyukh, V V, Miroshnichenko, A S, Danford, S, Prendergast, P

“…ABSTRACT We present an analysis of 67 recent spectra of α UMi (Polaris) obtained in 2017 August–2018 May. Frequency analysis reveals an increase in the…”
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Properties of Galactic B[e] Supergiants. V. 3 Pup-Constraining the Orbital Parameters and Modeling the Circumstellar Environments by Miroshnichenko, A. S., Danford, S., Zharikov, S. V., Klochkova, V. G., Chentsov, E. L., Vanbeveren, D., Zakhozhay, O. V., Manset, N., Pogodin, M. A., Omarov, C. T., Kuratova, A. K., Khokhlov, S. A.

“…We report the results of long-term spectroscopic monitoring of the A-type supergiant with the B[e] phenomenon 3 Pup = HD 62623. We confirm earlier findings…”
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Spectroscopic studies of the unique yellow supergiant α Aqr in the Cepheid instability strip by Usenko, I. A., Miroshnichenko, A. S., Danford, S.

“…Based on 21 spectra with resolutions from 12 000 to 42 000 taken in 1997–2016 for the yellow supergiant α Aqr (which is believed to be nonvariable in the…”
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TOWARD UNDERSTANDING THE B[e] PHENOMENON. V. NATURE AND SPECTRAL VARIATIONS OF THE MWC 728 BINARY SYSTEM by Miroshnichenko, A S, Zharikov, S V, Danford, S, Manset, N, Korcakova, D, Kricek, R, Slechta, M, Omarov, Ch T, Kusakin, A V, Kuratov, K S, Grankin, K N

“…We report the results of a long-term spectroscopic monitoring of the FS CMa type object MWC 728. We found that it is a binary system with a B5 Ve (T sub(eff) =…”
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SPECTROSCOPIC INVESTIGATIONS OF THE POLARIS (α UMi) SYSTEM: RADIAL VELOCITY MEASUREMENTS, NEW ORBIT, AND COMPANION INFLUENCE FOR THE CEPHEID POLARIS Aa PULSATION ACTIVITY by Usenko, I. A., Miroshnichenko, A. S., Danford, S., Kovtyukh, V. V., Turner, D. G.

“…Thirty three spectra of the Polaris system obtained in August–December 2019 and February–April 2020 at the 0.81m telescope of the Three College Observatory…”
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PULSATIONAL ACTIVITY OF THE SMALL–AMPLITUDE CEPHEID POLARIS (α UMi) IN 2018-2019 by Usenko, I. A., Miroshnichenko, A. S., Danford, S., Kovtyukh, V. V.

“…We present the results of an analysis of 20 spectra of α UMi (Polaris) obtained in September 2018 – January 2019 using 0.81m telescope of the Three College…”
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PULSATIONAL ACTIVITY OF THE SMALL–AMPLITUDE CEPHEID POLARIS (α UMi) IN 2016-2017 by Usenko, I. A., Kovtyukh, V. V., Miroshnichenko, A. S., Danford, S.

“…We present the results of an analysis of 49 spectra of α UMi (Polaris) obtained during August – December 2016 and January – March 2017. Frequency analysis…”
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SPECTROSCOPIC INVESTIGATIONS OF GALACTIC CLUSTERS WITH ASSOCIATED CEPHEID VARIABLES. I. POLARIS CLUSTER AND α UMI by Usenko, I. A., Miroshnichenko, A. S., Danford, S., Kovtyukh, V. V., Turner, D. G., Shulga, A. V., Protsyuk, Yu. I.

“…We present the results of an analysis of the spectra of nine so called Polaris cluster A−FV stars obtained during 2016 - 2018. Radial velocities (RV) and GAIA…”
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EFFECTIVE TEMPERATURE AND RADIAL VELOCITY OF THE SMALL AMPLITUDE CEPHEID POLARIS (alpha UMi) IN 2015 by Usenko, I. A., Kovtyukh, V. V., Miroshnichenko, A. S., Danford, S.

“…We present the results of an analysis of 21 spectra of alpha UMi (Polaris) obtained in September – December 2015. Frequency analysis shows an increase of the…”
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SPECTROSCOPIC INVESTIGATIONS OF POLARIS FIELD STARS by Usenko, I. A., Miroshnichenko, A. S., Danford, S., Turner, D. G., Majaess, D. J., Balam, D. D.

“…We present the results of an analysis of 28 spectra of 18 Polaris field A–G V stars obtained in 2016–2023. Derived radial velocities and Teff along with…”
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SPECTROSCOPIC INVESTIGATIONS OF GALACTIC OPEN CLUSTER COLLINDER 394 – NEW RESULTS by Usenko, I.A., Kniazev, A.Yu, Miroshnichenko, A.S., Danford, S., Kovtyukh, V.V., Mishenina, T.V.

“…Confident main-sequence (MS) members of the Collinder 394 open cluster are perfect objects to check the correctness of their distances, obtained from the GAIA…”
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TOWARD UNDERSTANDING THE B[e] PHENOMENON. V. NATURE AND SPECTRAL VARIATIONS OF THE MWC 728 BINARY SYSTEM This paper is partly based on observations obtained at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council of Canada, the Institut National des Sciences de l ′ Univers of the Centre National de la Recherche Scientifique de France, and the University of Hawaii as well as on observations obtained at the 2.7 m Harlan J. Smith telescope of the McDonald Obs by Miroshnichenko, A. S., Zharikov, S. V., Danford, S., Manset, N., Korčáková, D., Kříček, R., Šlechta, M., Omarov, Ch. T., Kusakin, A. V., Kuratov, K. S., Grankin, K. N.

“…ABSTRACT We report the results of a long-term spectroscopic monitoring of the FS CMa type object MWC 728. We found that it is a binary system with a B5 ve ( T…”
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Active Greening or Rewilding the city: How does the intention behind small pockets of urban green affect use? by Danford, Rachel S., Strohbach, Michael W., Warren, Paige S., Ryan, Robert L.

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THE [Al/Mg] RATIO IN HALO STARS OF THE FIELD by LEA, SUZANNE M., DANFORD, STEPHEN C.

“…Newly determined magnesium and barium abundances for the halo horizontal-branch stars HD 2857 and HD 60778 are reported. Effects in model atmospheres which…”
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Variable stars in the core of the globular cluster M3 by Strader, Jay, Everitt, Henry O., Danford, Stephen

“…We present the results of a survey for variable stars in the core of the globular cluster M3. Our findings include the discovery of 11 new or suspected…”
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First detection of a magnetic field in low-luminosity B[e] stars: New scenarios for the nature and evolutionary stages of FS CMa stars by Korcakova, D, Sestito, F, Manset, N, Kroupa, P, Votruba, V, Slechta, M, Danford, S, Dvorakova, N, Raj, A, Chojnowski, S. D, Singh, H. P

“…A&A 659, A35 (2022) We report the first detection of the magnetic field in a star of FS CMa type, a subgroup of objects characterized by the B[e] phenomenon…”
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uvbyβ PHOTOMETRY OF THE OPEN CLUSTER M52 by DANFORD, STEPHEN C., THOMAS, JON

“…Photometric uvbyß observations of the open cluster M52 (NGC 7654) are used to determine the cluster's distance modulus (V ₀-Mv = 10.83 ± 0.24) and mean cluster…”
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A MICROCOMPUTER-BASED ASTRONOMICAL IMAGE-DISPLAY SYSTEM by FULLTON, JAMES M., DANFORD, STEPHEN C., MUIR, ROBERT

“…A microcomputer-based digital image-display system is described. Its key features are 16-level false color representation, image-region magnification, and…”
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Properties of Galactic B[e] Supergiants: V. 3 Pup -- constraining the orbital parameters and modeling the circumstellar environments by Miroshnichenko, A. S, Danford, S, Zharikov, S. V, Klochkova, V. G, Chentsov, E. L, Vanbeveren, D, Zakhozhay, O. V, Manset, N, Pogodin, M. A, Omarov, C. T, Kuratova, A. K, Khokhlov, S. A

“…We report the results of a long-term spectroscopic monitoring of the A-type supergiant with the B[e] phenomenon 3 Pup = HD 62623. We confirm earlier findings…”
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Effective temperature and radial velocity of the small-amplitude Cepheid Polaris (alpha UMi) in 2015 by Usenko, I. A, Kovtyukh, V. V, Miroshnichenko, A. S, Danford, S

“…We present the results of an analysis of 21 spectra of alpha UMi (Polaris) obtained in September - December 2015. Frequency analysis shows an increase of the…”
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