Главная     Введение     Выжить во Вселенной    
Inhabited Sky
    News@Sky     Астрофотография     Коллекция     Форум     Blog New!     Помощь     Пресса     Войти  

HD 113694


Оглавление

Изображения

Загрузить ваше изображение

DSS Images   Other Images


Публикации по объекту

The X-Ray Emission of A-Type Stars
From X-ray images in the ROSAT public archives, we determine soft X-rayfluxes, or flux upper limits, for 74 A-type stars, which have beenobserved during deep integrations with the PSPC. Nine supposedly single,late A stars (0.20 < B-V < 0.35) are found to coincide with X-raysources. The X-ray luminosities we infer for these stars range fromlevels comparable to the Active Sun, at log L_x ~27.6, to much brighteremission levels similar to those observed for active late-type binarysystems, near log L_x ~30.1. Another 10 sources are identified withearly A stars (0.0 < B-V < 0.2). Five of these are confirmeddouble stars, the rest are ostensibly single. The maximum luminosity wedetect in the early A stars, log L_x = 30.1, is 3.5 orders of magnitudebrighter than the X-ray upper limits for the nondetected stars.Additional study, including radial velocity monitoring and/or opticalinterferometry, will be needed to determine whether the putativelysingle X-ray emitting stars are in fact single, or whether theiremission is produced entirely or in part by unknown or unresolved binarycompanions. The level of X-ray emission associated with chemicallynormal, single A stars thus far appears to be uncorrelated with anyobvious stellar property, including the rotation rate, which is known togreatly influence the dynamo activity and the X-ray emission levels oflower mass stars. (SECTION: Stars)

A second list of wide visual binaries
Not Available

A second list of wide visual binaries
Not Available

Добавить новую статью


Внешние ссылки

  • - Внешних ссылок не найдено -
Добавить внешнюю ссылку


Группы:


Наблюдательные данные и астрометрия

Созвездие:Хамелеон
Прямое восхождение:13h08m20.41s
Склонение:-78°26'45.7"
Видимая звёздная величина:6.421
Расстояние:137.741 парсек
Собственное движение RA:-38.6
Собственное движение Dec:-26.2
B-T magnitude:6.44
V-T magnitude:6.423

Каталоги и обозначения:
Собственные имена   (Edit)
HD 1989HD 113694
TYCHO-2 2000TYC 9417-763-1
USNO-A2.0USNO-A2 0075-03496382
HIPHIP 64108

→ Запросить дополнительные каталоги и обозначения от VizieR