唧筒座AG ，也稱為HD 89353和 HR 4049，是顆位於唧筒座的前漸近巨星分支恆星。一顆非常貧金屬星，它被富含幾種分子的一層厚厚聯星拱星盤環繞著，視星等5.53等，在理想的條件下隨時都可以用裸眼看見這顆恆星。這顆恆星的距離大約是；然而，像許多單獨的特殊恆星一樣，這顆恆星有著獨特的頻譜。這顆恆星基於其巴耳末系的譜線，是顆藍超巨星，實際上它是顆位於前漸近巨星分支階段的老年低質量恆星。這顆恆星正在進行激烈的質量損失，唯一改變的是在5.29和5.83星等間，以429天的週期改變光度。
參考資料
外部連結
- [http://adsabs.harvard.edu/abs/2006IAUJD..11E..20E The Spatial Distribution of Grains Around the Dual Chemistry Post-AGB Star]
- [http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2003/28/aah4032/aah4032.html Synthetic post-AGB evolution]
- [http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2001/41/aa1595/aa1595.html Non-linear radiative models of post-AGB stars: Application to HD 56126]
- [http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2006/17/aa3553-05/aa3553-05.html Post-AGB stars as testbeds of nucleosynthesis in AGB stars]
- [http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2003/27/aa3404/aa3404.html The post-AGB evolution of AGB mass loss variations]
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