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58 Result(s)

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

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  1. 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)

  2. 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)

  3. No Access

    Article

    Activity of the Seyfert galaxy NGC 4151 in the near-IR in 1994–2011

    We present the results of our infrared J H K L photometry of the Seyfert galaxy NGC 4151 during its active period in 1995–2011. The variable IR source was still in its active state in 2011, though its observed lu...

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

  4. 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)

  5. No Access

    Article

    Photometric activity of UX Ori stars and related objects in the near infrared and visual. BF Ori, CQ Tau, WW Vul, and SV Cep

    We have analyzed the activity of four UX Ori stars in the near-IR (JHKL) and visual (V) using the results of long-term photometric observations. For comparison, we also obtained IR (JHKLM) photometric observation...

    V. I. Shenavrin, V. P. Grinin, A. N. Rostopchina-Shakhovskaja… in Astronomy Reports (2012)

  6. No Access

    Article

    Spectroscopy and photometry of the symbiotic nova PU Vul during its nebular phase and minimum of 2007

    We present the results of our analysis of the spectrophotometric and photometric data for the symbiotic nova PU Vul acquired in 2001–2008. The continuum in the optical observed in 2006–2008 cannot be reconcile...

    A. A. Tatarnikova, A. M. Tatarnikov, V. F. Esipov, T. N. Tarasova… in Astronomy Reports (2011)

  7. 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)

  8. No Access

    Article

    Search for and study of hot circumstellar dust envelopes

    Long-term (1984–2008) JHKLM photometry for 254 objects is presented. The observations were carried out in the standard JHKLM photometric system using an original method and a modern IR photometer designed and bui...

    V. I. Shenavrin, O. G. Taranova, A. E. Nadzhip in Astronomy Reports (2011)

  9. No Access

    Article

    IR photometry and models of dust shells for two RCB stars

    We present JHKLM photometry obtained in 1984–2009 for the RCB stars UV Cas and SU Tau. No major fadings characteristic of RCB stars were detected during the observations of UV Cas, while two events of this kind o...

    M. B. Bogdanov, O. G. Taranova, V. I. Shenavrin in Astronomy Reports (2010)

  10. 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)

  11. No Access

    Article

    Infrared photometry for two RV Tau stars and V1027 Cyg

    We present and discuss the results of our long-term JHKLM photometry for two RV Tau stars (R Sge and RV Tau) and the yellow supergiant V1027 Cyg, a candidate for protoplanetary nebulae. The amplitude of the infra...

    O. G. Taranova, V. I. Shenavrin, A. M. Tatarnikov in Astronomy Letters (2009)

  12. No Access

    Article

    Near-infrared observations of Comet C/2004 Q2 (Machholz)

    Our observations of Comet C/2004 Q2 (Machholz) in the range from 1.2 to 4.8 µm indicate that the material outflowed from the cometary surface in the form of fragments that separated into gas and dust under sub...

    I. A. Maslov, A. E. Nadzhip, V. I. Shenavrin in Astronomy Letters (2008)

  13. No Access

    Article

    Infrared photometry of eight planetary nebulae

    We discuss the infrared (IR) (1.25–5 µm) photometry of eight planetary nebulae performed in 1999–2006. For all of the nebulae under study, we have firmly established IR brightness and color variations on time ...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2007)

  14. No Access

    Article

    Unusual infrared fading of CH Cygni in 2006

    Infrared observations of the unique symbiotic system CH Cyg in 2003–2006 are presented. Analysis of the observations has shown that a fairly dense dust structure (a cloud or a shell) appeared on the line of si...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2007)

  15. No Access

    Article

    JHKLM photometry for 22 hot stars

    We discuss our JHKLM photometry for 22 hot stars, 11 of which were identified in the General Catalogue of Variable Stars. For all of the observed objects, we have estimated the interstellar reddening, angular dia...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2006)

  16. No Access

    Article

    Infrared variability of the nucleus of the Seyfert galaxy NGC 1068 in 1998–2004

    Our 8-year-long JHKLM photometry of the Seyfert galaxy NGC 1068 has confirmed its IR variability. The amplitudes of the brightness variations in the J (1.25 µm) and K (2.2 µm) bands are within 0 .

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2006)

  17. No Access

    Article

    IR photometry and a model of a dust shell in V2108 Ophiuchi

    We present the results of JHKLM photometry of the oxygen Mira variable V2108 Oph acquired in 2000–2004. The period of brightness variations is refined (570 ± 3 days), and light and color curves in the near-IR are...

    M. B. Bogdanov, O. G. Taranova, V. I. Shenavrin in Astronomy Reports (2006)

  18. No Access

    Article

    Infrared photometry for five close binary systems

    We present the JHKLM photometry for five close (W Ser) binary systems obtained in the period 1996–2004. Positive phase shifts (with respect of the adopted ephemerides) have been found in the orbital infrared ligh...

    O. G. Taranova, V. I. Shenavrin in Astronomy Letters (2005)

  19. No Access

    Article

    IR photometry of the symbiotic star BF Cyg: Detection of the red giant’s ellipsoidal brightness variability

    We present the results of our IR photometric observations of the classical symbiotic star BF Cyg acquired in 1978–2003. The variability range in the J and K bands was ∼0.2m. A periodic component in the cool star’...

    B. F. Yudin, V. I. Shenavrin, E. A. Kolotilov, A. A. Tatarnikova… in Astronomy Reports (2005)

  20. No Access

    Article

    Dissipation of the hot dust envelope of CH Cygni (1996–2003)

    Our analysis of JHKLM photometric data obtained in 1978–2003 for the CH Cyg system shows that the “local” dust envelope that formed in the system in 1986 and reached its highest column density in 1996 had largely...

    O. G. Taranova, V. I. Shenavrin in Astronomy Reports (2004)

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