Outburst in Mira A

نویسندگان

  • Margarita Karovska
  • Eric Schlegel
  • Warren Hack
  • John Raymond
  • Brian E. Wood
چکیده

We report here the Chandra ACIS-S detection of a bright soft X-ray transient in the Mira AB interacting symbiotic-like binary. We resolved the system for the first time in the X-rays. Using Chandra and HST images we determined that the unprecedented outburst is likely associated with the cool AGB star (Mira A), the prototype of Miratype variables. X-rays have never before been detected from an AGB star, and the recent activity signals that the system is undergoing dramatic changes. The total X-ray luminosity of the system is several times higher than the luminosity estimated using previous XMM and ROSAT observations. The outburst may be caused by a giant flare in Mira A associated with a mass ejection or a jet, and may have long term consequences on the system. Subject headings: binaries: symbiotic— stars: activity — stars: AGB and post-AGB — stars: Individual (Mira AB)— stars: winds, outflows — X-Rays: general

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

LINEAR PULSATION CHARACTERISTICS OF MIRA VARIABLE STARS

The linear adiabatic pulsation-periods of Mira variable stars have been derived. Approximately 2701[1]models were calculated for M = 0.7 MΘ to 2 MΘ stars with radii from 180 RΘ to 340 RΘ and luminosities from 2800 LΘ to 10,000 LΘ. The chemical composition of all models is (X,Z) = (0.7,0.02). From the result of this study, linear relations on Luminosity-Period-Mass relationship and luminosity-pe...

متن کامل

Parenting Styles and Dimensions of Children\'s Maladaptive Behaviors

Objective: Many behavioral problems are resulting from inappropriate parenting styles and inattention to behavioral-emotional difficulties in childhood. The purpose of this research was to examine the relationship between parenting styles and dimensions of children's maladaptive behaviors. Methods: 120 six-year old boys, who were enrolled in the first grade of elementary school, were selecte...

متن کامل

Soybean Oil Degumming by Immobilized Phospholipase A1

In the present study, we investigated the ability of an immobilized phospholipase A1 (PLA1) in degumming of soybean oil. The enzyme was immobilized by simple adsorption on bentonite without any further modification. The free and immobilized PLA1 were characterized by Fourier Transform InfraRed (FT-IR) spectroscopy and X-Ray Diffraction (XRD). The immobilizat...

متن کامل

A 'superoutburst' in Xte J1118+480

I propose that the properties of the two outbursts observed in the X-ray transient XTE J1118+480 in 2000 are akin to super-outbursts of SU UMa stars. In these systems a 'normal' outburst immediately precedes a 5–10 times longer ('super')outburst. The optical light curve of the outbursts of XTE J1118+480 is remarkably similar to that seen in some SU UMa stars, such as UV Per and T Leo, where the...

متن کامل

Study of Gas Environment Impacts on Volumetric Coal Matrix Changes

The Outburst can be defined as a sudden release of coal and rock accompanied by large quantities of gas into the underground coal mine workings which represents a major hazard in underground coal mines. Gas drainage has been proven to be successful in reducing outburst hazards by decreasing the in-situ gas pressure. One of aspect of gas drainage from coal seams is coal matrix volume changes. Cu...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2005