论文标题
在本地体积星系中搜索LBV：研究NGC 4449中的四颗星
Search for LBVs in the Local Volume galaxies: study of four stars in NGC 4449
论文作者
论文摘要
我们继续在当地小组以外的星系中寻找LBV星星。在这项工作中，我们研究了NGC 4449中的四个发光星。对J122810.94+440540.6，J122811.70+440550.9和J1222809.72+440514.8进行了多个光谱观测，揭示了其光谱的特征，该特征是LBV的特征。 Photometry showed noticeable brightness changes of J122809.72+440514.8 ($ΔI=0.69\pm0.13^m$) and J122817.83+440630.8 ($ΔR=2.15\pm0.13^m$), while the variability of J122810.94+440540.6 and J122811.70+440550.9不超过$ 0.3^m $，无论其过滤器如何。我们已经获得了星际红色，光球温度和降压光度$ \ log（\ text {l} _ \ text {bol}/\ text {l} _ {\ odot}）\大约5.24-6.42 $。使用CMFGEN代码，我们对J122809.72+440514.8（$ t _ {\ text {fext {eff}} = 9300 \，$ k）的冷状态的频谱进行了建模5.2 \ times10^{ - 3} \，m _ {\ odot} \，yr^{ - 1} $。基于观察性能，将J122809.72+440514.8和J122817.83+440630.8分类为LBV，而其他两颗恒星被归类为LBV候选者或B [E] -Supergiants候选人
We continue to search for LBV stars in galaxies outside the Local Group. In this work, we have investigated four luminous stars in NGC 4449. Multiple spectral observations carried out for J122810.94+440540.6, J122811.70+440550.9, and J122809.72+440514.8 revealed the emission features in their spectra that are characteristic of LBVs. Photometry showed noticeable brightness changes of J122809.72+440514.8 ($ΔI=0.69\pm0.13^m$) and J122817.83+440630.8 ($ΔR=2.15\pm0.13^m$), while the variability of J122810.94+440540.6 and J122811.70+440550.9 does not exceed $0.3^m$ regardless of the filter. We have obtained estimates of the interstellar reddening, photosphere temperatures, and bolometric luminosities $\log(\text{L}_\text{Bol}/\text{L}_{\odot}) \approx 5.24-6.42$. Using the CMFGEN code, we have modelled the spectrum of the cold state of J122809.72+440514.8 ($T_{\text{eff}}=9300\,$K) and have obtained possible value of the mass loss rate $\dot{M} = 5.2\times10^{-3}\,M_{\odot}\,yr^{-1}$. Based on the observational properties, J122809.72+440514.8 and J122817.83+440630.8 were classified as LBVs, while the other two stars were classified as LBV candidates or B[e]-supergiants candidates
