论文标题
M31中的发光蓝色可变候选者
Luminous Blue Variable candidates in M31
论文作者
论文摘要
我们在仙女座银河系中研究了五个发光蓝色变量（LBV）候选物，并以银河系为单位（MN112）。我们在Apache Point天文台的3.5米望远镜和SAO RAS的6米望远镜上获得了相同的近红外（NIR）和光谱。候选物在光谱中显示出典型的LBV特征：宽且强的氢系，HEI，FEII和[FEII]线。我们使用光谱能量分布来估计恒星的温度，红色，半径和亮度。候选物的降压仪与仙女座星系中已知的LBV恒星相似。一个候选人J004341.84+411112.0演示了光度法变异性（V频段中约为0.27 mag），这使我们能够将其分类为LBV。星J004415.04+420156.2显示了b [e] supergiants的典型特征。星J004411.36+413257.2被归类为FEII星。我们确认恒星J004621.08+421308.2和J004507.65+413740.8是温暖的超级巨人。我们首次获得银河LBV候选MN112的NIR光谱。我们使用MN112的光谱和NIR光谱与M31中的相似恒星进行比较，并在J004341.84+411112.0中注意相同的光谱和相同的温度。这使我们能够确认MN112是LBV，它应该在更长的时间跨度观察中显示其亮度变异性。
We study five Luminous Blue Variable (LBV) candidates in the Andromeda galaxy and one more (MN112) in the Milky Way. We obtain the same-epoch near-infrared (NIR) and optical spectra on the 3.5-meter telescope at the Apache Point Observatory and on the 6-meter telescope of the SAO RAS. The candidates show typical LBV features in their spectra: broad and strong hydrogen lines, HeI, FeII, and [FeII] lines. We estimate the temperatures, reddening, radii and luminosities of the stars using their spectral energy distributions. Bolometric luminosities of the candidates are similar to those of known LBV stars in the Andromeda galaxy. One candidate, J004341.84+411112.0, demonstrates photometric variability (about 0.27 mag in V band), which allows us to classify it as a LBV. The star J004415.04+420156.2 shows characteristics typical for B[e]-supergiants. The star J004411.36+413257.2 is classified as FeII star. We confirm that the stars J004621.08+421308.2 and J004507.65+413740.8 are warm hypergiants. We for the first time obtain NIR spectrum of the Galactic LBV candidate MN112. We use both optical and NIR spectra of MN112 for comparison with similar stars in M31 and notice identical spectra and the same temperature in the J004341.84+411112.0. This allows us to confirm that MN112 is a LBV, which should show its brightness variability in longer time span observations.
