与奇怪的孤立恒星BP双鱼座有关的气体和尘埃
Gas and Dust Associated with the Strange, Isolated, Star BP Piscium
摘要：
我们进行了一次多波长观测活动，展示了红外明亮变星BP Psc的一些显着特性。被一个致密的尘埃气体盘所包围，这颗很少被研究的晚G（或早K）型恒星在红外波长下发射了大约75%的探测到的能量通量。与狭窄的双极喷流和赫比格-哈罗天体一起吸积气体的证据显然与BP Psc作为前主序星的分类相一致，正如大多数以前的研究所假设的那样。如果它年轻，那么BP Psc将是已知最接近和最古老的经典金牛座T星之一。然而，这样的演化分类遇到了各种问题，如果BP Psc是一个光度III类主序后恒星，那么这些问题就不存在或不那么严重。在这种情况下，它将是第一个已知的第一个上升巨星被大质量分子盘包围的例子，伴随着快速的气体吸积和突出的喷流和HH物体。在这个模型中，大质量尘埃气体盘的成因可能是一个低质量伴星的结果。盘中的属性可能有助于目前行星的形成，在BP Psc本身形成后的十亿年或更长时间。
英文摘要：
We have carried out a multiwavelength observational campaign demonstrating some of the remarkable properties of the infrared-bright variable star BP Psc. Surrounded by a compact dusty, gaseous disk, this little-studied late-G (or early-K) type star emits about 75% of its detected energy flux at infrared wavelengths. Evidence for accretion of gas in conjunction with narrow bi-polar jets and Herbig-Haro objects is apparently consistent with classification of BP Psc as a pre-main sequence star, as postulated in most previous studies. If young, then BP Psc would be one of the nearest and oldest known classical T Tauri stars. However, such an evolutionary classification encounters various problems that are absent or much less severe if BP Psc is instead a luminosity class III post-main sequence star. In this case, it would be the first known example of a first ascent giant surrounded by a massive molecular disk with accompanying rapid gas accretion and prominent jets and HH objects. In this model, the genesis of the massive dusty gaseous disk could be a consequence of the envelopment of a low mass companion star. Properties in the disk may be conducive to the current formation of planets, a gigayear or more after the formation of BP Psc itself.
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