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36 Result(s)

within V. I. Shenavrin Remove this filter Astronomy, Observations and Techniques Remove this filter Astrophysics and Astroparticles Remove this filter

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  1. No Access

    Article

    Study of the Carbon Star T Draconis

    We present the results of the infrared photometric observations in the \(JHKLM\) ... bands and infrared spec...

    A. M. Tatarnikov, S. G. Zheltoukhov, V. I. Shenavrin… in Astronomy Letters (2024)

  2. No Access

    Article

    Recurrent Symbiotic Nova T Coronae Borealis before Outburst

    The results of photometric and spectral observations of T CrB obtained in a wide range of wavelengths in 2011–2023 are presented. We use the near-IR light curves to determine a new ephemeris

    N. A. Maslennikova, A. M. Tatarnikov, A. A. Tatarnikova, A. V. Dodin… in Astronomy Letters (2023)

  3. No Access

    Article

    FG Sge: New Multicolor Photometry and Short-Term Dust Shell Clearing in 2019

    We present the results of a new stage of the long-term photometric study of FG Sge which is a quickly evolving central star of the planetary nebula Hen 1-5. Our new observations carried out on the SAI MSU tele...

    V. P. Arkhipova, N. P. Ikonnikova, V. I. Shenavrin, M. A. Burlak… in Astronomy Letters (2022)

  4. No Access

    Article

    Multicolor Photometry and Peculiarities of the Spectrum for the post-AGB Candidate AU Vulpeculae (IRAS 20160+2734)

    We present the results of a UBVRcIc and JHKLM photometric monitoring campaign conducted in 2016–2020, low-resolution spectroscopy, and an analysis of the ASAS-3 and ASAS-SN photometric data for the semiregular...

    N. P. Ikonnikova, V. I. Shenavrin, G. V. Komissarova, M. A. Burlak… in Astronomy Letters (2021)

  5. No Access

    Article

    Surprising Variability of the Planetary Nebula IC 4997 \(=\) QV Sge

    We present the results of a new epoch (2009–2019) of a long-term (50 years) photometric monitoring of the variable planetary nebula IC 4997 (QV Sge). The integral (star + nebula) \(UBV\) light curves display a ...

    V. P. Arkhipova, M. A. Burlak, N. P. Ikonnikova, G. V. Komissarova… in Astronomy Letters (2020)

  6. No Access

    Article

    A Model of the Dust Envelope of the Carbon Mira Star V CrB from Photometry, Infrared Spectroscopy, and Speckle Polarimetry

    \(UBVJHKLM\) photometry for the carbon Mira star V CrB are presented. The infrared observations we...

    A. A. Fedoteva, A. M. Tatarnikov, B. S. Safonov, V. I. Shenavrin… in Astronomy Letters (2020)

  7. No Access

    Article

    The Relative Wavelength Independence of IR Time Lags in NGC 4151 during the Years 2010–2015

    We present results of a study of the correlation between the infrared (JHKL) and optical (B) fluxes of the nucleus of the Seyfert galaxy NGC 4151 for the years 2010–2015 using our own data (partially published) i...

    V. L. Oknyansky, V. I. Shenavrin, N. V. Metlova, C. M. Gaskell in Astronomy Letters (2019)

  8. No Access

    Article

    Cool Spots on the Surface of the Active Giant PZ Mon

    Based on the multicolor (BVRIJHKL) photometric observations of the active red giant PZ Mon performed for the first time in the winter season of 2017–2018, we have determined the main characteristics of the spotte...

    Yu. V. Pakhomov, V. I. Shenavrin, N. I. Bondar’, K. A. Antonyuk… in Astronomy Letters (2019)

  9. No Access

    Article

    Quiescent and Active States of V1413 Aql I: Photometric Activity Criterion and the Detection of a Secondary Minimum

    We present the results of our photometric UBV JHKL observations for the symbiotic star V1413 Aql obtained in 2012–2018. An analysis of the data has shown that inMay 2017 the system passed to a quiescent state wit...

    A. A. Tatarnikova, A. M. Tatarnikov, E. A. Kolotilov, V. I. Shenavrin… in Astronomy Letters (2018)

  10. No Access

    Article

    Multicolor Photometry and Spectroscopy of the Yellow Supergiant with Dust Envelope HD 179821 = V1427 Aquilae

    We present the results of multicolor (UBV JHKLM) photometry (2009–2017) and low-resolution spectroscopy (2016–2017) of the semi-regular variable V1427 Aql = HD 179821, a yellow supergiant with gas-dust envelope. ...

    N. P. Ikonnikova, O. G. Taranova, V. P. Arkhipova, G. V. Komissarova… in Astronomy Letters (2018)

  11. No Access

    Article

    Photometric and spectroscopic study of the supergiant with an infrared excess V1027 Cygni

    We present the results of our UBV and JHKLM photometry for the semiregular pulsating variable V1027 Cyg, a supergiant with an infrared excess, over the period from 1997 to 2015 (UBV) and in 2009–2015 (JHKLM). Tog...

    V. P. Arkhipova, O. G. Taranova, N. P. Ikonnikova, V. F. Esipov… in Astronomy Letters (2016)

  12. No Access

    Article

    Symbiotic nova V1016 Cygni: Evolution of the dust envelope and the gaseous nebula

    As a result of the next cycle of our long-term monitoring, we present our UBV JHKLM photometry for the symbiotic nova V1016 Cyg in 2008–2014. The star continued to systematically fade and redden in UBV: over this...

    V. P. Arkhipova, O. G. Taranova, N. P. Ikonnikova, V. F. Esipov… in Astronomy Letters (2015)

  13. No Access

    Article

    Infrared variability of three hot stars on a time scale of 10–20 years

    Long-term (1994–2014) near-infrared observations of P Cyg, kDra, and BUTau are analyzed. It is shown that the observed brightness and color variations in P Cyg and k Dra can be explained by variations in the p...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2015)

  14. No Access

    Article

    JHKLM-Observations of the Unique Eclipsing System ε Aur During a Secondary Minimum

    Photometric data in the JHKLM near infrared bands obtained in 1999-2000 are presented for the long-period eclipsing system ε Aur. The time of secondary eclipse (when the F21 supergiant eclipses a dust disk sur...

    I. A. Maslov, A. E. Nadjip, O. G. Taranova, A. M. Tatarnikov… in Astrophysics (2014)

  15. No Access

    Article

    Correlation of near-infrared and optical variability of NGC 4151 in 2008–2013

    We investigate the correlation between infrared (JHKL) and optical (B) fluxes of the variable nucleus of the Seyfert galaxy NGC4151 using partially published data for the last 6 years (2008–2013). We find that th...

    V. L. Oknyansky, N. V. Metlova, O. G. Taranova, V. I. Shenavrin… in Astronomy Letters (2014)

  16. No Access

    Article

    Infrared photometry of Nova Delphini 2013 (=V339 Del) in the first sixty days after its outburst

    The results of JHKLM photometry for Nova Delphini 2013 obtained in the first sixty days after its outburst are analyzed. Analysis of the energy distribution in a wide spectral range (0.36–5 µm) has shown that the...

    O. G. Taranova, A. M. Tatarnikov, V. I. Shenavrin, A. A. Tatarnikova in Astronomy Letters (2014)

  17. No Access

    Article

    FG SGE: Evolution of the circumstellar dust shell (JHKLM Photometry in 1985–2013)

    Long-term (1985–2013) JHKLM photometry for FG Sge is analyzed. Parameters of the supergiant and optical properties of the dust in the dust shell (DS) have been refined. Given the optical photometry, the spectral ...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2013)

  18. No Access

    Article

    New activity cycle of the classical symbiotic star V1413 Aql

    We present the results of our photometric UBV JHKLM observations in 2008–2011 for the classical symbiotic star V1413 Aql. At the end of 2008, the hot component of V1413 Aql experienced the next strong outburst (Δ

    E. A. Kolotilov, G. V. Komissarova, A. A. Tatarnikova… in Astronomy Letters (2012)

  19. No Access

    Article

    WR 140 (=V1687 Cyg): Infrared photometry, 2001–2010

    We present the results of our infrared observations of WR 140 (=V1687 Cyg) in 2001–2010. Analysis of the observations has shown that the J brightness at maximum increased near the periastron by about 0 ...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2011)

  20. No Access

    Article

    Infrared photometry for three RV Tau variable stars

    We have analyzed our long-term (1995–2008) JHKLM photometry for three variable RV Tau supergiants. It follows from this analysis that: the amplitude of the JHK brightness variations is approximately the same, 0 ...

    O. G. Taranova, V. I. Shenavrin, A. M. Tatarnikov in Astronomy Letters (2010)

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