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Tuesday, July 21, 2020 | History

5 edition of Am Herculis Light Curves 1977-1995 (Aavso Monograph) found in the catalog.

Am Herculis Light Curves 1977-1995 (Aavso Monograph)

Janet A. Mattei

Am Herculis Light Curves 1977-1995 (Aavso Monograph)

by Janet A. Mattei

  • 194 Want to read
  • 25 Currently reading

Published by American Association of Variable Star Observe .
Written in English

    Subjects:
  • Astrophysics & Space Science,
  • Science

  • The Physical Object
    FormatPaperback
    Number of Pages48
    ID Numbers
    Open LibraryOL12110932M
    ISBN 101878174215
    ISBN 109781878174215
    OCLC/WorldCa37001905

      Light curves are graphs that show the brightness of an object over a period of time. In the study of objects which change their brightness over time, such as novae, supernovae, and variable stars, the light curve is a simple but valuable tool to a scientist. We present a new mapping algorithm, the "Accretion Stream Mapping (ASM)" which uses the full phase-coverage of a light curve to derive spatially resolved intensity distributions along the accretion stream in magnetic cataclysmic variables of AM Herculis type (polars). The surface of the accretion stream is approximated as a duodecadon shaped tube.

      History of Light And Lighting by David L. Dilaura (Author) ISBN This light curve was to be used to construct a computer model of the star system, including star spots if necessary. The resulting model yielded two F class stars rotating around each other with .

    The name sets up confusion with upper-case "U" Herculis, which is a ninth magnitude Mira- type deep red giant variable. They could not be more different. 68 ("u") Her is a hot class B binary (B dwarf plus B5 "giant," but not really) light years away (give or take 57) rather well off the plane of the Milky Way. An Intermediate Polar (also called a DQ Herculis Star) is a type of cataclysmic variable binary star system with a white dwarf and a cool main-sequence secondary star. In most cataclysmic variables, matter from the companion star is gravitationally stripped by the compact star and forms an accretion disk around it. In intermediate polar systems, the same general scenario applies except that.


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Am Herculis Light Curves 1977-1995 (Aavso Monograph) by Janet A. Mattei Download PDF EPUB FB2

Adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86AAuthor: Janet A.

Mattei, Elizabeth O. Waagen, E. Grant Foster. Get this from a library. AM Herculis light curves: [Janet A Mattei; Elizabeth O Waagen; E Grant Foster; American Association of Variable Star Observers.;]. ISBN: OCLC Number: Notes: "Dedicated to Lewis M. Cook." Description: ix pages, 64 leaves: illustrations ; 28 cm.

Series Title. This monograph contains light curves of the polar cataclysmic type variable AM Herculis from through (JD ). The AAVSO long-term light curve of AM Am Herculis Light Curves 1977-1995 book for this interval is presented.

This light curve has been included to give a more complete picture of AM Herculis's behavior. The observations that comprise this light curve may be visual; photoelectric photometry (V Author: Janet A. Mattei, H. Gamze Menali, Elizabeth O. Waagen. This monograph contains light curves of the magnetic X-ray variable AM Herculis from April through December The AAVSO long-term light curve.

The photoelectric light curves of MM Her obtained in and by Evren (, ) were analyzed by two different methods. Firsly, the effects of the wave-like distortions on the observations were removed from the observed magnitudes by obtaining its mathematical expression.

The remaining light curves were analyzed by using Wood's approach. Figure 1 shows the RoboScope5 light curve of AM Her complemented by the AAVSO light curve of the system. The times of the observations from papers I and II are included in the figure (A-C), along with the time of the new MMT observations (D).

As described in Kafka et al. (), Paper I and Paper II, AM Her in the low state. The X-ray light curve shows extreme variability on timescales of seconds and suggests an orbital period of order 8 hr, nearly twice that of the longest cataloged AM Her period.

When bright, the X. The RS CVn-type eclipsing binary MM Her was observed photoelectrically inB andV colours. The light curves obtained in and are presented. It was found that the depths of the primary minima are decreased from to However, the amplitude of the wave-like distortion outside the eclipses was detected to increase since The period of migration was determined to be about   The opposite end of the ribbon is much less well defined as shown by the sloping rise of the light curves in VV Pup and ST LMi (and the fall in BL Hyi).

Evidence for a variable length or brightness of the ribbon can be seen in Fig. 3 where two soft Xay light curves of ST LMi are shown obtained in October and in January /34/. Light curve of HZ Herculis. By L. Petro and W.

Hiltner. Abstract. The optical counterpart of Her X-1 was observed for B-magnitude on 34 nights between July 30 and Octo The scatter in the light curve is about mag and may be related to the day cycle.

Some nova-like variables show superhumps, like those seen in the SU UMa stars in superoutburst. Unlike the superoutbursting systems, however, these nova-likes have superhumps in their light curves all the time. They are the permanent superhumpers.

An interesting group of CV systems that show permanent superhumps is the AM Canum Venaticorum stars. An international conference entitled "Zdenek Kopal's Binary Star Legacy" was held on the occasion of the late Professor Kopal's 90th birthday in his home town of Litomyšl/Czech Republic and dedicated to the memory of one of the leading astronomers of the 20th century.

Professor Kopal, who devoted. VV Puppis is an AM Herculis type binary system exhibiting variable circular and linear polarisation1. In its ‘normal’ state, the optical light curve shows a slow rise to maximum (mmax∼ History.

AM Herculis was first cataloged in by Max Wolf and was listed at the time as Veränderlicherwhich is now AN in the General Catalogue of Variable was observed to be an irregular variable star ranging from 12 to 14 in apparent magnitude. Inthe astronomer S.

Tapia discovered that light from the star is both linearly and circularly polarized. Deming, D., Seager, S., et al. and the TESS Team, “Discovery and Characterization of Transiting Super Earths Using an All-Sky Transit Survey and Follow-up by the James Webb Space Telescope”PASP,Seager, S., & Deming, D.“On the Method to Infer an Atmosphere on a Tidally-Locked Super Earth.

PSPC light curves of 4 bright sources from the ROSAT soft X-ray All sky Survey identified as new or problable new AM Herculis binaries. NEW CATACLYSMIC VARIABLES Besides providing a synoptic view of the known CVs, the ROSAT Survey has led to the discovery of numerous new X-ray sources, the identification of which represents a tremendous task.

The light-curve synthesis presented in this paper indicates that the eclipsing binary is a classical Algol-type system with parameters of q =i = 87 57, and Δ(T 1 - T 2) = K; the primary component fills approximately 77% of its limiting lobe and is slightly larger than the lobe-filling secondary component.

More than times of. We report on two years of photometric and spectroscopic observation of the recently discovered AM Herculis star RX J A sharp eclipse feature is present in the optical and X-ray light curves, repeating with a period of /- s.

Improvements to Eclipsing Binary Light Curve Modeling: the Report of a Decade: Milone, E. A 2-D Numerical Simulation of the Circulation in the Envelope of a Contact Binary System, an Update: Zhou, Dao-Qi; Leung, Kam-Ching: Binary Population among Pre-Main Sequence Stars: Chen, Wen Ping; Jeng, Yung Jyh: The Binary Star Population.

These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from to mag. in V (those with amplitudes larger than mag. and assymetric light curves are designated HADS) and periods from to days. The shapes of the light curves, periods, and amplitudes usually vary greatly.The mean count rate obtained from the light curve is ctss−1.

In one ROSAT orbit a count rate far above the average ( ctss−1) was measured. We consider this as a singular event not typical for the orbital variation. With-out this point the mean count rate drops to ctss−1. In order to show that the light curve is not dominated.

A light curve of the Beta Lyrae type eclipsing binary star 68 Herculis is presented, based on photoelectric measurements made at the Texas A&M observatory.

Data were collected between October and July with U, B, V, R, and I filters. A previously determined period and epoch are confirmed. I. INTRODUCTION.